cc: Add main frame timing info to frame timing tracker.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index a1a61618720e9b678b4aa577dee5866da683f52d..5d99d20848e36d1e293bc3cb84b720423b0c8129 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -1044,6 +1044,11 @@ void LayerImpl::PassFrameTimingRequests(
   SetNeedsPushProperties();
 }
 
+void LayerImpl::GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids) {
+  for (const auto& request : frame_timing_requests_)

[brianderson, 2015/03/25 19:46:15]

To avoid potential multiple resizes:

request_ids->insert(request_ids.end(), frame_timing_requests_.begin(),
frame_timing_requests_.end())

Or:

DCHECK(request_ids.empty());
request_ids.swap(frame_timing_requests_);

[vmpstr, 2015/03/26 21:02:22]

It goes from a vector<FrameTimingRequest> to vector<int64_t>, so I'm not sure
that would work here.
(It does a request.id() below). I could reserve request_ids to
requests_ids.size() + frame_timing_requests_.size()? I think that's a bit
premature though.

[brianderson, 2015/03/26 21:14:18]

Didn't notice that. Nevermind then.

+    request_ids->push_back(request.id());
+}
+
 void LayerImpl::SetTransform(const gfx::Transform& transform) {
   if (transform_ == transform)
     return;