Implement frame attribution (FrameBlamer)

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index a41cdb260b8e4372543204bdd996cae5d36ee182..13189d377f9747e3507bf56aa43354bfa0a20c7b 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -29,6 +29,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event_argument.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
@@ -1015,6 +1016,7 @@ RenderFrameImpl::RenderFrameImpl(const CreateParams& params)
       media_player_delegate_(NULL),
       is_using_lofi_(false),
       is_pasting_(false),
+      blame_context_(nullptr),
       weak_factory_(this) {
   std::pair<RoutingIDFrameMap::iterator, bool> result =
       g_routing_id_frame_map.Get().insert(std::make_pair(routing_id_, this));
@@ -1064,12 +1066,15 @@ RenderFrameImpl::~RenderFrameImpl() {
 
 void RenderFrameImpl::BindToWebFrame(blink::WebLocalFrame* web_frame) {
   DCHECK(!frame_);
+  DCHECK(!blame_context_);
 
   std::pair<FrameMap::iterator, bool> result = g_frame_map.Get().insert(
       std::make_pair(web_frame, this));
   CHECK(result.second) << "Inserting a duplicate item.";
 
   frame_ = web_frame;
+  blame_context_ = new RenderFrameBlameContext(this);
+  blame_context_->Initialize();
 }
 
 void RenderFrameImpl::Initialize() {
@@ -2520,6 +2525,11 @@ blink::WebCookieJar* RenderFrameImpl::cookieJar() {
   return &cookie_jar_;
 }
 
+blink::BlameContext* RenderFrameImpl::frameBlameContext() {
+  DCHECK(blame_context_);
+  return blame_context_;
+}
+
 blink::WebServiceWorkerProvider*
 RenderFrameImpl::createServiceWorkerProvider() {
   // At this point we should have non-null data source.