Implement frame attribution (FrameBlamer)

third_party/WebKit/public/platform/BlameContext.h

Index: third_party/WebKit/public/platform/BlameContext.h
diff --git a/third_party/WebKit/public/platform/URLConversion.h b/third_party/WebKit/public/platform/BlameContext.h
similarity index 55%
copy from third_party/WebKit/public/platform/URLConversion.h
copy to third_party/WebKit/public/platform/BlameContext.h
index 599e2796d203e5b5a44f6892787137833cfa4f91..9a616d711d9d9523e4fd8efdfe06552a4bd44d21 100644
--- a/third_party/WebKit/public/platform/URLConversion.h
+++ b/third_party/WebKit/public/platform/BlameContext.h
@@ -2,19 +2,15 @@
 // 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 BlameContext_h
+#define BlameContext_h
 
-#include "WebCommon.h"
-
-class GURL;
+#include "base/trace_event/blame_context.h"
 
 namespace blink {
 
-class WebString;
-
-BLINK_COMMON_EXPORT GURL WebStringToGURL(const WebString&);
+using BlameContext = base::trace_event::BlameContext;
 
 } // namespace blink
 
-#endif
+#endif // BlameContext_h