Trace LayoutObject src attributes and parent frames

content/renderer/frame_blame_context.h

Index: content/renderer/frame_blame_context.h
diff --git a/content/renderer/frame_blame_context.h b/content/renderer/frame_blame_context.h
index 5e4d3dcbd5a39414137d1cb7d81abb25c774b155..7f35ad6cca1e4b9eddd53167ff0f4b16ec615bf8 100644
--- a/content/renderer/frame_blame_context.h
+++ b/content/renderer/frame_blame_context.h
@@ -18,6 +18,12 @@ class FrameBlameContext : public base::trace_event::BlameContext {
   FrameBlameContext(RenderFrameImpl* frame, RenderFrameImpl* parent_frame);
   ~FrameBlameContext() override;
 
+ protected:
+  void AsValueInto(base::trace_event::TracedValue* value) override;
+
+ private:
+  RenderFrameImpl* frame_;
+
   DISALLOW_COPY_AND_ASSIGN(FrameBlameContext);
 };