Implement frame attribution (FrameBlamer)

third_party/WebKit/public/platform/WebBlameContext.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef URLConversion_h
-#define URLConversion_h
+#ifndef WebBlameContext_h
+#define WebBlameContext_h
 
 #include "WebCommon.h"
 
-class GURL;
-
 namespace blink {
 
-class WebString;
-
-BLINK_COMMON_EXPORT GURL WebStringToGURL(const WebString&);
+class BLINK_PLATFORM_EXPORT WebBlameContext {
+public:
+    virtual void enter() = 0;
+    virtual void leave() = 0;
+};
 
 } // namespace blink
 
-#endif
+#endif // WebBlameContext_h