Implement frame attribution (FrameBlamer)

content/renderer/frame_blame_context.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_FRAME_BLAME_CONTEXT_H_
+#define CONTENT_RENDERER_FRAME_BLAME_CONTEXT_H_
+
+#include "base/trace_event/blame_context.h"
+
+namespace content {
+
+class RenderFrameImpl;
+class RenderThreadBlameContext;
+
+// A blame context which represents a single render frame.
+class FrameBlameContext : public base::trace_event::BlameContext {
+ public:
+  FrameBlameContext(RenderFrameImpl* frame, RenderFrameImpl* parent_frame);
+  ~FrameBlameContext() override;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameBlameContext);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_FRAME_BLAME_CONTEXT_H_