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diff --git a/external/v8/include/v8-profiler.h b/external/v8/include/v8-profiler.h
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+// Copyright 2010 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_V8_PROFILER_H_
+#define V8_V8_PROFILER_H_
+
+#include "v8.h"
+
+/**
+ * Profiler support for the V8 JavaScript engine.
+ */
+namespace v8 {
+
+class HeapGraphNode;
+struct HeapStatsUpdate;
+
+typedef uint32_t SnapshotObjectId;
+
+/**
+ * CpuProfileNode represents a node in a call graph.
+ */
+class V8_EXPORT CpuProfileNode {
+ public:
+  /** Returns function name (empty string for anonymous functions.) */
+  Handle<String> GetFunctionName() const;
+
+  /** Returns id of the script where function is located. */
+  int GetScriptId() const;
+
+  /** Returns resource name for script from where the function originates. */
+  Handle<String> GetScriptResourceName() const;
+
+  /**
+   * Returns the number, 1-based, of the line where the function originates.
+   * kNoLineNumberInfo if no line number information is available.
+   */
+  int GetLineNumber() const;
+
+  /**
+   * Returns 1-based number of the column where the function originates.
+   * kNoColumnNumberInfo if no column number information is available.
+   */
+  int GetColumnNumber() const;
+
+  /** Returns bailout reason for the function
+    * if the optimization was disabled for it.
+    */
+  const char* GetBailoutReason() const;
+
+  /**
+    * Returns the count of samples where the function was currently executing.
+    */
+  unsigned GetHitCount() const;
+
+  /** Returns function entry UID. */
+  unsigned GetCallUid() const;
+
+  /** Returns id of the node. The id is unique within the tree */
+  unsigned GetNodeId() const;
+
+  /** Returns child nodes count of the node. */
+  int GetChildrenCount() const;
+
+  /** Retrieves a child node by index. */
+  const CpuProfileNode* GetChild(int index) const;
+
+  static const int kNoLineNumberInfo = Message::kNoLineNumberInfo;
+  static const int kNoColumnNumberInfo = Message::kNoColumnInfo;
+};
+
+
+/**
+ * CpuProfile contains a CPU profile in a form of top-down call tree
+ * (from main() down to functions that do all the work).
+ */
+class V8_EXPORT CpuProfile {
+ public:
+  /** Returns CPU profile title. */
+  Handle<String> GetTitle() const;
+
+  /** Returns the root node of the top down call tree. */
+  const CpuProfileNode* GetTopDownRoot() const;
+
+  /**
+   * Returns number of samples recorded. The samples are not recorded unless
+   * |record_samples| parameter of CpuProfiler::StartCpuProfiling is true.
+   */
+  int GetSamplesCount() const;
+
+  /**
+   * Returns profile node corresponding to the top frame the sample at
+   * the given index.
+   */
+  const CpuProfileNode* GetSample(int index) const;
+
+  /**
+   * Returns the timestamp of the sample. The timestamp is the number of
+   * microseconds since some unspecified starting point.
+   * The point is equal to the starting point used by GetStartTime.
+   */
+  int64_t GetSampleTimestamp(int index) const;
+
+  /**
+   * Returns time when the profile recording was started (in microseconds)
+   * since some unspecified starting point.
+   */
+  int64_t GetStartTime() const;
+
+  /**
+   * Returns time when the profile recording was stopped (in microseconds)
+   * since some unspecified starting point.
+   * The point is equal to the starting point used by GetStartTime.
+   */
+  int64_t GetEndTime() const;
+
+  /**
+   * Deletes the profile and removes it from CpuProfiler's list.
+   * All pointers to nodes previously returned become invalid.
+   */
+  void Delete();
+};
+
+
+/**
+ * Interface for controlling CPU profiling. Instance of the
+ * profiler can be retrieved using v8::Isolate::GetCpuProfiler.
+ */
+class V8_EXPORT CpuProfiler {
+ public:
+  /**
+   * Changes default CPU profiler sampling interval to the specified number
+   * of microseconds. Default interval is 1000us. This method must be called
+   * when there are no profiles being recorded.
+   */
+  void SetSamplingInterval(int us);
+
+  /**
+   * Starts collecting CPU profile. Title may be an empty string. It
+   * is allowed to have several profiles being collected at
+   * once. Attempts to start collecting several profiles with the same
+   * title are silently ignored. While collecting a profile, functions
+   * from all security contexts are included in it. The token-based
+   * filtering is only performed when querying for a profile.
+   *
+   * |record_samples| parameter controls whether individual samples should
+   * be recorded in addition to the aggregated tree.
+   */
+  void StartProfiling(Handle<String> title, bool record_samples = false);
+
+  /** Deprecated. Use StartProfiling instead. */
+  V8_DEPRECATED("Use StartProfiling",
+      void StartCpuProfiling(Handle<String> title,
+                             bool record_samples = false));
+
+  /**
+   * Stops collecting CPU profile with a given title and returns it.
+   * If the title given is empty, finishes the last profile started.
+   */
+  CpuProfile* StopProfiling(Handle<String> title);
+
+  /** Deprecated. Use StopProfiling instead. */
+  V8_DEPRECATED("Use StopProfiling",
+      const CpuProfile* StopCpuProfiling(Handle<String> title));
+
+  /**
+   * Tells the profiler whether the embedder is idle.
+   */
+  void SetIdle(bool is_idle);
+
+ private:
+  CpuProfiler();
+  ~CpuProfiler();
+  CpuProfiler(const CpuProfiler&);
+  CpuProfiler& operator=(const CpuProfiler&);
+};
+
+
+/**
+ * HeapSnapshotEdge represents a directed connection between heap
+ * graph nodes: from retainers to retained nodes.
+ */
+class V8_EXPORT HeapGraphEdge {
+ public:
+  enum Type {
+    kContextVariable = 0,  // A variable from a function context.
+    kElement = 1,          // An element of an array.
+    kProperty = 2,         // A named object property.
+    kInternal = 3,         // A link that can't be accessed from JS,
+                           // thus, its name isn't a real property name
+                           // (e.g. parts of a ConsString).
+    kHidden = 4,           // A link that is needed for proper sizes
+                           // calculation, but may be hidden from user.
+    kShortcut = 5,         // A link that must not be followed during
+                           // sizes calculation.
+    kWeak = 6              // A weak reference (ignored by the GC).
+  };
+
+  /** Returns edge type (see HeapGraphEdge::Type). */
+  Type GetType() const;
+
+  /**
+   * Returns edge name. This can be a variable name, an element index, or
+   * a property name.
+   */
+  Handle<Value> GetName() const;
+
+  /** Returns origin node. */
+  const HeapGraphNode* GetFromNode() const;
+
+  /** Returns destination node. */
+  const HeapGraphNode* GetToNode() const;
+};
+
+
+/**
+ * HeapGraphNode represents a node in a heap graph.
+ */
+class V8_EXPORT HeapGraphNode {
+ public:
+  enum Type {
+    kHidden = 0,         // Hidden node, may be filtered when shown to user.
+    kArray = 1,          // An array of elements.
+    kString = 2,         // A string.
+    kObject = 3,         // A JS object (except for arrays and strings).
+    kCode = 4,           // Compiled code.
+    kClosure = 5,        // Function closure.
+    kRegExp = 6,         // RegExp.
+    kHeapNumber = 7,     // Number stored in the heap.
+    kNative = 8,         // Native object (not from V8 heap).
+    kSynthetic = 9,      // Synthetic object, usualy used for grouping
+                         // snapshot items together.
+    kConsString = 10,    // Concatenated string. A pair of pointers to strings.
+    kSlicedString = 11,  // Sliced string. A fragment of another string.
+    kSymbol = 12         // A Symbol (ES6).
+  };
+
+  /** Returns node type (see HeapGraphNode::Type). */
+  Type GetType() const;
+
+  /**
+   * Returns node name. Depending on node's type this can be the name
+   * of the constructor (for objects), the name of the function (for
+   * closures), string value, or an empty string (for compiled code).
+   */
+  Handle<String> GetName() const;
+
+  /**
+   * Returns node id. For the same heap object, the id remains the same
+   * across all snapshots.
+   */
+  SnapshotObjectId GetId() const;
+
+  /** Returns node's own size, in bytes. */
+  V8_DEPRECATED("Use GetShallowSize instead",
+                int GetSelfSize() const);
+
+  /** Returns node's own size, in bytes. */
+  size_t GetShallowSize() const;
+
+  /** Returns child nodes count of the node. */
+  int GetChildrenCount() const;
+
+  /** Retrieves a child by index. */
+  const HeapGraphEdge* GetChild(int index) const;
+};
+
+
+/**
+ * An interface for exporting data from V8, using "push" model.
+ */
+class V8_EXPORT OutputStream {  // NOLINT
+ public:
+  enum WriteResult {
+    kContinue = 0,
+    kAbort = 1
+  };
+  virtual ~OutputStream() {}
+  /** Notify about the end of stream. */
+  virtual void EndOfStream() = 0;
+  /** Get preferred output chunk size. Called only once. */
+  virtual int GetChunkSize() { return 1024; }
+  /**
+   * Writes the next chunk of snapshot data into the stream. Writing
+   * can be stopped by returning kAbort as function result. EndOfStream
+   * will not be called in case writing was aborted.
+   */
+  virtual WriteResult WriteAsciiChunk(char* data, int size) = 0;
+  /**
+   * Writes the next chunk of heap stats data into the stream. Writing
+   * can be stopped by returning kAbort as function result. EndOfStream
+   * will not be called in case writing was aborted.
+   */
+  virtual WriteResult WriteHeapStatsChunk(HeapStatsUpdate* data, int count) {
+    return kAbort;
+  }
+};
+
+
+/**
+ * HeapSnapshots record the state of the JS heap at some moment.
+ */
+class V8_EXPORT HeapSnapshot {
+ public:
+  enum SerializationFormat {
+    kJSON = 0  // See format description near 'Serialize' method.
+  };
+
+  /** Returns heap snapshot UID (assigned by the profiler.) */
+  unsigned GetUid() const;
+
+  /** Returns heap snapshot title. */
+  Handle<String> GetTitle() const;
+
+  /** Returns the root node of the heap graph. */
+  const HeapGraphNode* GetRoot() const;
+
+  /** Returns a node by its id. */
+  const HeapGraphNode* GetNodeById(SnapshotObjectId id) const;
+
+  /** Returns total nodes count in the snapshot. */
+  int GetNodesCount() const;
+
+  /** Returns a node by index. */
+  const HeapGraphNode* GetNode(int index) const;
+
+  /** Returns a max seen JS object Id. */
+  SnapshotObjectId GetMaxSnapshotJSObjectId() const;
+
+  /**
+   * Deletes the snapshot and removes it from HeapProfiler's list.
+   * All pointers to nodes, edges and paths previously returned become
+   * invalid.
+   */
+  void Delete();
+
+  /**
+   * Prepare a serialized representation of the snapshot. The result
+   * is written into the stream provided in chunks of specified size.
+   * The total length of the serialized snapshot is unknown in
+   * advance, it can be roughly equal to JS heap size (that means,
+   * it can be really big - tens of megabytes).
+   *
+   * For the JSON format, heap contents are represented as an object
+   * with the following structure:
+   *
+   *  {
+   *    snapshot: {
+   *      title: "...",
+   *      uid: nnn,
+   *      meta: { meta-info },
+   *      node_count: nnn,
+   *      edge_count: nnn
+   *    },
+   *    nodes: [nodes array],
+   *    edges: [edges array],
+   *    strings: [strings array]
+   *  }
+   *
+   * Nodes reference strings, other nodes, and edges by their indexes
+   * in corresponding arrays.
+   */
+  void Serialize(OutputStream* stream, SerializationFormat format) const;
+};
+
+
+/**
+ * An interface for reporting progress and controlling long-running
+ * activities.
+ */
+class V8_EXPORT ActivityControl {  // NOLINT
+ public:
+  enum ControlOption {
+    kContinue = 0,
+    kAbort = 1
+  };
+  virtual ~ActivityControl() {}
+  /**
+   * Notify about current progress. The activity can be stopped by
+   * returning kAbort as the callback result.
+   */
+  virtual ControlOption ReportProgressValue(int done, int total) = 0;
+};
+
+
+/**
+ * Interface for controlling heap profiling. Instance of the
+ * profiler can be retrieved using v8::Isolate::GetHeapProfiler.
+ */
+class V8_EXPORT HeapProfiler {
+ public:
+  /**
+   * Callback function invoked for obtaining RetainedObjectInfo for
+   * the given JavaScript wrapper object. It is prohibited to enter V8
+   * while the callback is running: only getters on the handle and
+   * GetPointerFromInternalField on the objects are allowed.
+   */
+  typedef RetainedObjectInfo* (*WrapperInfoCallback)
+      (uint16_t class_id, Handle<Value> wrapper);
+
+  /** Returns the number of snapshots taken. */
+  int GetSnapshotCount();
+
+  /** Returns a snapshot by index. */
+  const HeapSnapshot* GetHeapSnapshot(int index);
+
+  /**
+   * Returns SnapshotObjectId for a heap object referenced by |value| if
+   * it has been seen by the heap profiler, kUnknownObjectId otherwise.
+   */
+  SnapshotObjectId GetObjectId(Handle<Value> value);
+
+  /**
+   * Returns heap object with given SnapshotObjectId if the object is alive,
+   * otherwise empty handle is returned.
+   */
+  Handle<Value> FindObjectById(SnapshotObjectId id);
+
+  /**
+   * Clears internal map from SnapshotObjectId to heap object. The new objects
+   * will not be added into it unless a heap snapshot is taken or heap object
+   * tracking is kicked off.
+   */
+  void ClearObjectIds();
+
+  /**
+   * A constant for invalid SnapshotObjectId. GetSnapshotObjectId will return
+   * it in case heap profiler cannot find id  for the object passed as
+   * parameter. HeapSnapshot::GetNodeById will always return NULL for such id.
+   */
+  static const SnapshotObjectId kUnknownObjectId = 0;
+
+  /**
+   * Callback interface for retrieving user friendly names of global objects.
+   */
+  class ObjectNameResolver {
+   public:
+    /**
+     * Returns name to be used in the heap snapshot for given node. Returned
+     * string must stay alive until snapshot collection is completed.
+     */
+    virtual const char* GetName(Handle<Object> object) = 0;
+   protected:
+    virtual ~ObjectNameResolver() {}
+  };
+
+  /**
+   * Takes a heap snapshot and returns it. Title may be an empty string.
+   */
+  const HeapSnapshot* TakeHeapSnapshot(
+      Handle<String> title,
+      ActivityControl* control = NULL,
+      ObjectNameResolver* global_object_name_resolver = NULL);
+
+  /**
+   * Starts tracking of heap objects population statistics. After calling
+   * this method, all heap objects relocations done by the garbage collector
+   * are being registered.
+   *
+   * |track_allocations| parameter controls whether stack trace of each
+   * allocation in the heap will be recorded and reported as part of
+   * HeapSnapshot.
+   */
+  void StartTrackingHeapObjects(bool track_allocations = false);
+
+  /**
+   * Adds a new time interval entry to the aggregated statistics array. The
+   * time interval entry contains information on the current heap objects
+   * population size. The method also updates aggregated statistics and
+   * reports updates for all previous time intervals via the OutputStream
+   * object. Updates on each time interval are provided as a stream of the
+   * HeapStatsUpdate structure instances.
+   * The return value of the function is the last seen heap object Id.
+   *
+   * StartTrackingHeapObjects must be called before the first call to this
+   * method.
+   */
+  SnapshotObjectId GetHeapStats(OutputStream* stream);
+
+  /**
+   * Stops tracking of heap objects population statistics, cleans up all
+   * collected data. StartHeapObjectsTracking must be called again prior to
+   * calling PushHeapObjectsStats next time.
+   */
+  void StopTrackingHeapObjects();
+
+  /**
+   * Deletes all snapshots taken. All previously returned pointers to
+   * snapshots and their contents become invalid after this call.
+   */
+  void DeleteAllHeapSnapshots();
+
+  /** Binds a callback to embedder's class ID. */
+  void SetWrapperClassInfoProvider(
+      uint16_t class_id,
+      WrapperInfoCallback callback);
+
+  /**
+   * Default value of persistent handle class ID. Must not be used to
+   * define a class. Can be used to reset a class of a persistent
+   * handle.
+   */
+  static const uint16_t kPersistentHandleNoClassId = 0;
+
+  /** Returns memory used for profiler internal data and snapshots. */
+  size_t GetProfilerMemorySize();
+
+  /**
+   * Sets a RetainedObjectInfo for an object group (see V8::SetObjectGroupId).
+   */
+  void SetRetainedObjectInfo(UniqueId id, RetainedObjectInfo* info);
+
+ private:
+  HeapProfiler();
+  ~HeapProfiler();
+  HeapProfiler(const HeapProfiler&);
+  HeapProfiler& operator=(const HeapProfiler&);
+};
+
+
+/**
+ * Interface for providing information about embedder's objects
+ * held by global handles. This information is reported in two ways:
+ *
+ *  1. When calling AddObjectGroup, an embedder may pass
+ *     RetainedObjectInfo instance describing the group.  To collect
+ *     this information while taking a heap snapshot, V8 calls GC
+ *     prologue and epilogue callbacks.
+ *
+ *  2. When a heap snapshot is collected, V8 additionally
+ *     requests RetainedObjectInfos for persistent handles that
+ *     were not previously reported via AddObjectGroup.
+ *
+ * Thus, if an embedder wants to provide information about native
+ * objects for heap snapshots, he can do it in a GC prologue
+ * handler, and / or by assigning wrapper class ids in the following way:
+ *
+ *  1. Bind a callback to class id by calling SetWrapperClassInfoProvider.
+ *  2. Call SetWrapperClassId on certain persistent handles.
+ *
+ * V8 takes ownership of RetainedObjectInfo instances passed to it and
+ * keeps them alive only during snapshot collection. Afterwards, they
+ * are freed by calling the Dispose class function.
+ */
+class V8_EXPORT RetainedObjectInfo {  // NOLINT
+ public:
+  /** Called by V8 when it no longer needs an instance. */
+  virtual void Dispose() = 0;
+
+  /** Returns whether two instances are equivalent. */
+  virtual bool IsEquivalent(RetainedObjectInfo* other) = 0;
+
+  /**
+   * Returns hash value for the instance. Equivalent instances
+   * must have the same hash value.
+   */
+  virtual intptr_t GetHash() = 0;
+
+  /**
+   * Returns human-readable label. It must be a null-terminated UTF-8
+   * encoded string. V8 copies its contents during a call to GetLabel.
+   */
+  virtual const char* GetLabel() = 0;
+
+  /**
+   * Returns human-readable group label. It must be a null-terminated UTF-8
+   * encoded string. V8 copies its contents during a call to GetGroupLabel.
+   * Heap snapshot generator will collect all the group names, create
+   * top level entries with these names and attach the objects to the
+   * corresponding top level group objects. There is a default
+   * implementation which is required because embedders don't have their
+   * own implementation yet.
+   */
+  virtual const char* GetGroupLabel() { return GetLabel(); }
+
+  /**
+   * Returns element count in case if a global handle retains
+   * a subgraph by holding one of its nodes.
+   */
+  virtual intptr_t GetElementCount() { return -1; }
+
+  /** Returns embedder's object size in bytes. */
+  virtual intptr_t GetSizeInBytes() { return -1; }
+
+ protected:
+  RetainedObjectInfo() {}
+  virtual ~RetainedObjectInfo() {}
+
+ private:
+  RetainedObjectInfo(const RetainedObjectInfo&);
+  RetainedObjectInfo& operator=(const RetainedObjectInfo&);
+};
+
+
+/**
+ * A struct for exporting HeapStats data from V8, using "push" model.
+ * See HeapProfiler::GetHeapStats.
+ */
+struct HeapStatsUpdate {
+  HeapStatsUpdate(uint32_t index, uint32_t count, uint32_t size)
+    : index(index), count(count), size(size) { }
+  uint32_t index;  // Index of the time interval that was changed.
+  uint32_t count;  // New value of count field for the interval with this index.
+  uint32_t size;  // New value of size field for the interval with this index.
+};
+
+
+}  // namespace v8
+
+
+#endif  // V8_V8_PROFILER_H_