[tracing] Expose AddOwnershipEdge and CreateAllocatorDump with guid to blink. (blink-side).

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 560 matching lines @@
     // registerMemoryDumpProvider() method.
     // See crbug.com/458295 for design docs.
     virtual void registerMemoryDumpProvider(blink::WebMemoryDumpProvider*) { }
 
     // Must be called on the thread that called registerMemoryDumpProvider().
     virtual void unregisterMemoryDumpProvider(blink::WebMemoryDumpProvider*) { }
 
     // Returns a newly allocated WebProcessMemoryDump instance.
     virtual blink::WebProcessMemoryDump* createProcessMemoryDump() { return nullptr; }
 
+    typedef uint64_t WebMemoryAllocatorDumpGuid;
+
+    // Returns guid corresponding to the given string (the hash value) for
+    // creating a WebMemoryAllocatorDump.
+    virtual WebMemoryAllocatorDumpGuid createWebMemoryAllocatorDumpGuid(const WebString& guidStr) { return 0; }
+
     // GPU ----------------------------------------------------------------
     //
     // May return null if GPU is not supported.
     // Returns newly allocated and initialized offscreen WebGraphicsContext3D instance.
     // Passing an existing context to shareContext will create the new context in the same share group as the passed context.
     virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&, WebGraphicsContext3D* shareContext) { return nullptr; }
     virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&, WebGraphicsContext3D* shareContext, WebGLInfo* glInfo) { return nullptr; }
     virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&) { return nullptr; }
 
     // Returns a newly allocated and initialized offscreen context provider. The provider may return a null
@@ skipping 127 matching lines @@
 protected:
     BLINK_PLATFORM_EXPORT Platform();
     virtual ~Platform() { }
 
     WebThread* m_mainThread;
 };
 
 } // namespace blink
 
 #endif