cc: Introduce BeginFrame sequence numbers and acknowledgements.

cc/trees/single_thread_proxy.cc

 // Copyright 2011 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 "cc/trees/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 432 matching lines @@
 
   if (compositor_frame_sink_lost_) {
     RequestNewCompositorFrameSink();
     // RequestNewCompositorFrameSink could have synchronously created an output
     // surface, so check again before returning.
     if (compositor_frame_sink_lost_)
       return;
   }
 
   BeginFrameArgs begin_frame_args(BeginFrameArgs::Create(
-      BEGINFRAME_FROM_HERE, frame_begin_time, base::TimeTicks(),
+      BEGINFRAME_FROM_HERE, 0, 0, frame_begin_time, base::TimeTicks(),
       BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL));
 
   // Start the impl frame.
   {
     DebugScopedSetImplThread impl(task_runner_provider_);
     WillBeginImplFrame(begin_frame_args);
   }
 
   // Run the "main thread" and get it to commit.
   {
@@ skipping 221 matching lines @@
 
   std::vector<std::unique_ptr<SwapPromise>> empty_swap_promises;
   layer_tree_host_impl_->BeginMainFrameAborted(reason,
                                                std::move(empty_swap_promises));
   scheduler_on_impl_thread_->BeginMainFrameAborted(reason);
 }
 
 DrawResult SingleThreadProxy::ScheduledActionDrawIfPossible() {
   DebugScopedSetImplThread impl(task_runner_provider_);
   LayerTreeHostImpl::FrameData frame;
+  frame.begin_frame_source_id =
+      scheduler_on_impl_thread_->CurrentBeginFrameSourceId();
+  frame.begin_frame_number =
+      scheduler_on_impl_thread_->CurrentBeginFrameNumber();
+  frame.oldest_incorporated_frame =
+      scheduler_on_impl_thread_->OldestIncorporatedFrameForActiveTree();
   return DoComposite(&frame);
 }
 
 DrawResult SingleThreadProxy::ScheduledActionDrawForced() {
   NOTREACHED();
   return INVALID_RESULT;
 }
 
 void SingleThreadProxy::ScheduledActionCommit() {
   DebugScopedSetMainThread main(task_runner_provider_);
@@ skipping 39 matching lines @@
 void SingleThreadProxy::DidFinishImplFrame() {
   layer_tree_host_impl_->DidFinishImplFrame();
 #if DCHECK_IS_ON()
   DCHECK(inside_impl_frame_)
       << "DidFinishImplFrame called while not inside an impl frame!";
   inside_impl_frame_ = false;
 #endif
 }
 
 }  // namespace cc