Implement frame attribution (FrameBlamer)

content/renderer/web_blame_context_impl.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 CONTENT_RENDERER_WEB_BLAME_CONTEXT_IMPL_H_
+#define CONTENT_RENDERER_WEB_BLAME_CONTEXT_IMPL_H_
+
+#include "third_party/WebKit/public/platform/WebBlameContext.h"
+
+#include "base/macros.h"
+
+namespace base {
+namespace debug {
+class BlameContextBase;
+}
+}
+
+namespace content {
+
+class WebBlameContextImpl : public blink::WebBlameContext {
+ public:
+  WebBlameContextImpl(base::debug::BlameContextBase* context);
+
+  // blink::WebBlameContext implementation:
+  void enter() override;
+  void leave() override;
+
+ private:
+  base::debug::BlameContextBase* context_;  // Not owned.
+
+  DISALLOW_COPY_AND_ASSIGN(WebBlameContextImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_WEB_BLAME_CONTEXT_IMPL_H_