Implement frame attribution (FrameBlamer)

content/renderer/frame_blame_context.cc

+// 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.
+
+#include "content/renderer/frame_blame_context.h"
+
+#include "base/trace_event/trace_event_argument.h"
+#include "content/renderer/render_frame_impl.h"
+#include "content/renderer/top_level_blame_context.h"
+#include "third_party/WebKit/public/platform/Platform.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+
+namespace content {
+namespace {
+
+base::trace_event::BlameContext* GetParentBlameContext(
+    RenderFrameImpl* parent_frame) {
+  if (parent_frame)
+    return parent_frame->frameBlameContext();
+  return blink::Platform::current()->topLevelBlameContext();
+}
+
+}  // namespace
+
+const char kFrameBlameContextCategory[] = "blink";
+const char kFrameBlameContextName[] = "FrameBlameContext";
+const char kFrameBlameContextType[] = "Frame";
+const char kFrameBlameContextScope[] = "RenderFrame";
+
+FrameBlameContext::FrameBlameContext(RenderFrameImpl* render_frame,
+                                     RenderFrameImpl* parent_frame)
+    : base::trace_event::BlameContext(kFrameBlameContextCategory,
+                                      kFrameBlameContextName,
+                                      kFrameBlameContextType,
+                                      kFrameBlameContextScope,
+                                      render_frame->GetRoutingID(),
+                                      GetParentBlameContext(parent_frame)) {}
+
+FrameBlameContext::~FrameBlameContext() {}
+
+}  // namespace content