Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/platform/PurgeableVector.h

 /*
  * Copyright (C) 2014 Google Inc. 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
@@ skipping 21 matching lines @@
 #define PurgeableVector_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class WebDiscardableMemory;
+class WebProcessMemoryDump;
 
 // A simple vector implementation that supports purgeable memory. The vector is
 // already locked at construction and locking uses an internal counter which
 // means that N calls to lock() must be followed by N+1 calls to unlock() to
 // actually make the vector purgeable.
 class PLATFORM_EXPORT PurgeableVector {
     WTF_MAKE_NONCOPYABLE(PurgeableVector);
 public:
     enum PurgeableOption {
         NotPurgeable,
@@ skipping 31 matching lines @@
     void unlock();
 
     bool isLocked() const;
 
     // Note that this method should be used carefully since it may not use
     // exponential growth internally. This means that repeated/invalid uses of
     // it can result in O(N^2) append(). If you don't exactly know what you are
     // doing then you should probably not call this method.
     void reserveCapacity(size_t capacity);
 
+    void onMemoryDump(const String& dumpPrefix, WebProcessMemoryDump*) const;
+
 private:
     enum PurgeableAllocationStrategy {
         UseExactCapacity,
         UseExponentialGrowth,
     };
 
     // Copies data from the discardable buffer to the vector and clears the
     // discardable buffer.
     void moveDataFromDiscardableToVector();
 
@@ skipping 11 matching lines @@
     OwnPtr<WebDiscardableMemory> m_discardable;
     size_t m_discardableCapacity;
     size_t m_discardableSize;
     bool m_isPurgeable;
     int m_locksCount;
 };
 
 } // namespace blink
 
 #endif // PurgeableVector_h