Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/platform/SharedBuffer.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 19 matching lines @@
 #include "platform/PlatformExport.h"
 #include "platform/PurgeableVector.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+class WebProcessMemoryDump;
+
 class PLATFORM_EXPORT SharedBuffer : public RefCounted<SharedBuffer> {
 public:
     enum : unsigned { kSegmentSize = 0x1000 };
 
     static PassRefPtr<SharedBuffer> create() { return adoptRef(new SharedBuffer); }
     static PassRefPtr<SharedBuffer> create(size_t size) { return adoptRef(new SharedBuffer(size)); }
     static PassRefPtr<SharedBuffer> create(const char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
     static PassRefPtr<SharedBuffer> create(const unsigned char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
 
     static PassRefPtr<SharedBuffer> createPurgeable(const char* c, unsigned size) { return adoptRef(new SharedBuffer(c, size, PurgeableVector::Purgeable)); }
@@ skipping 45 matching lines @@
     // See PurgeableVector::lock().
     bool lock();
 
     // WARNING: Calling unlock() on a SharedBuffer that wasn't created with the
     // purgeability option does an extra memcpy(). Please use
     // SharedBuffer::createPurgeable() if you intend to call unlock().
     void unlock();
 
     bool isLocked() const;
 
+    void onMemoryDump(const String& dumpPrefix, WebProcessMemoryDump*) const;
+
 private:
     SharedBuffer();
     explicit SharedBuffer(size_t);
     SharedBuffer(const char*, int);
     SharedBuffer(const unsigned char*, int);
     SharedBuffer(const char*, unsigned, PurgeableVector::PurgeableOption);
 
     // See SharedBuffer::data().
     void mergeSegmentsIntoBuffer() const;
 
     unsigned m_size;
     mutable PurgeableVector m_buffer;
     mutable Vector<char*> m_segments;
 };
 
 } // namespace blink
 
 #endif // SharedBuffer_h