Trace LayoutObject src attributes and parent frames

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/strings/stringprintf.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(
@@ skipping 10 matching lines @@
 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)) {}
+                                      GetParentBlameContext(parent_frame)),
+      frame_(render_frame) {
+}
 
 FrameBlameContext::~FrameBlameContext() {}
 
+void FrameBlameContext::AsValueInto(base::trace_event::TracedValue* value) {
+  value->BeginDictionary("LayoutTree");
+  value->SetString("scope", "LayoutTree");
+  value->SetString("id_ref", base::StringPrintf("%p", frame_->GetWebFrame()));
+  value->EndDictionary();
+}
+
 }  // namespace content