[cc] Set BeginFrame sequence numbers on CompositorFrames from Scheduler.

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 83853354649b20e8bb6e61f433606cc97a696759..c201a7b6574123bfde8571e54d99ab0873639b3a 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -447,7 +447,7 @@ void SingleThreadProxy::CompositeImmediately(base::TimeTicks frame_begin_time) {
   }
 
   BeginFrameArgs begin_frame_args(BeginFrameArgs::Create(
-      BEGINFRAME_FROM_HERE, 0, 1, frame_begin_time, base::TimeTicks(),
+      BEGINFRAME_FROM_HERE, UINT32_MAX, 1, frame_begin_time, base::TimeTicks(),

[brianderson, 2017/02/24 01:08:38]

Can you make this a BeginFrameArgs constant with a meaningful name?

[Eric Seckler, 2017/02/27 11:50:32]

Done.

       BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL));
 
   // Start the impl frame.
@@ -483,6 +483,10 @@ void SingleThreadProxy::CompositeImmediately(base::TimeTicks frame_begin_time) {
     layer_tree_host_impl_->Animate();
 
     LayerTreeHostImpl::FrameData frame;
+    frame.begin_frame_source_id = begin_frame_args.source_id;
+    frame.begin_frame_sequence_number = begin_frame_args.sequence_number;
+    frame.latest_confirmed_begin_frame_sequence_number =
+        begin_frame_args.sequence_number;
     DoComposite(&frame);
 
     // DoComposite could abort, but because this is a synchronous composite
@@ -689,6 +693,13 @@ void SingleThreadProxy::BeginMainFrameAbortedOnImplThread(
 DrawResult SingleThreadProxy::ScheduledActionDrawIfPossible() {
   DebugScopedSetImplThread impl(task_runner_provider_);
   LayerTreeHostImpl::FrameData frame;
+  frame.begin_frame_source_id =
+      scheduler_on_impl_thread_->CurrentBeginFrameSourceId();
+  frame.begin_frame_sequence_number =
+      scheduler_on_impl_thread_->CurrentBeginFrameSequenceNumber();
+  frame.latest_confirmed_begin_frame_sequence_number =
+      scheduler_on_impl_thread_
+          ->LatestConfirmedBeginFrameSequenceNumberForActiveTree();
   return DoComposite(&frame);
 }