Introduce a way to grab heap stats.

include/v8.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3723 matching lines @@
   void operator=(const Locker&);
 };
 
 
 /**
  * An interface for exporting data from V8, using "push" model.
  */
 class V8EXPORT OutputStream {  // NOLINT
  public:
   enum OutputEncoding {
-    kAscii = 0  // 7-bit ASCII.
+    kAscii = 0,  // 7-bit ASCII.
+    kUint32 = 1
   };
   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; }
   /** Get preferred output encoding. Called only once. */
   virtual OutputEncoding GetOutputEncoding() { return kAscii; }
   /**
    * 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 WriteUint32Chunk(uint32_t* data, int count) = 0;
 };
 
 
 /**
  * An interface for reporting progress and controlling long-running
  * activities.
  */
 class V8EXPORT ActivityControl {  // NOLINT
  public:
   enum ControlOption {
@@ skipping 538 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_