Implement frame attribution (FrameBlamer)

third_party/WebKit/public/platform/Platform.h

 /*
  * Copyright (C) 2012 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Platform_h
 #define Platform_h
 
 #ifdef WIN32
 #include <windows.h>
 #endif
 
+#include "BlameContext.h"
 #include "UserMetricsAction.h"
 #include "WebAudioDevice.h"
 #include "WebCommon.h"
 #include "WebData.h"
 #include "WebDeviceLightListener.h"
 #include "WebGamepadListener.h"
 #include "WebGamepads.h"
 #include "WebGestureDevice.h"
 #include "WebGraphicsContext3D.h"
 #include "WebLocalizedString.h"
@@ skipping 303 matching lines @@
 
     // Threads -------------------------------------------------------
 
     // Creates an embedder-defined thread.
     virtual WebThread* createThread(const char* name) { return nullptr; }
 
     // Returns an interface to the current thread. This is owned by the
     // embedder.
     virtual WebThread* currentThread() { return nullptr; }
 
+    // Returns a blame context for attributing work to the thread-global scope.
+    virtual BlameContext* threadBlameContext() { return nullptr; }

[esprehn, 2016/03/31 00:47:04]

can this get a better name? Platform is used by many threads.

[Sami, 2016/03/31 10:29:49]

I've changed it to "topLevelBlameContext" with a more informative comment.

+
     // Resources -----------------------------------------------------------
 
     // Returns a blob of data corresponding to the named resource.
     virtual WebData loadResource(const char* name) { return WebData(); }
 
     // Decodes the in-memory audio file data and returns the linear PCM audio data in the destinationBus.
     // A sample-rate conversion to sampleRate will occur if the file data is at a different sample-rate.
     // Returns true on success.
     virtual bool loadAudioResource(WebAudioBus* destinationBus, const char* audioFileData, size_t dataSize) { return false; }
 
@@ skipping 248 matching lines @@
 protected:
     Platform();
     virtual ~Platform() { }
 
     WebThread* m_mainThread;
 };
 
 } // namespace blink
 
 #endif