cc: Adding BeginFrameTracker object and removing Now() from LTHI.

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/debug/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/output/context_provider.h"
@@ skipping 477 matching lines @@
     // RequestNewOutputSurface could have synchronously created an output
     // surface, so check again before returning.
     if (layer_tree_host_->output_surface_lost())
       return;
   }
 
   {
     BeginFrameArgs begin_frame_args(BeginFrameArgs::Create(
         BEGINFRAME_FROM_HERE, frame_begin_time, base::TimeTicks(),
         BeginFrameArgs::DefaultInterval(), BeginFrameArgs::SYNCHRONOUS));
+    layer_tree_host_impl_->UpdateCurrentBeginFrameArgs(begin_frame_args);
     DoBeginMainFrame(begin_frame_args);
     DoCommit();
 
     DCHECK_EQ(0u, layer_tree_host_->num_queued_swap_promises())
         << "Commit should always succeed and transfer promises.";
   }
 
   {
     DebugScopedSetImplThread impl(const_cast<SingleThreadProxy*>(this));
     if (layer_tree_host_impl_->settings().impl_side_painting) {
       layer_tree_host_impl_->ActivateSyncTree();
       layer_tree_host_impl_->active_tree()->UpdateDrawProperties();
       layer_tree_host_impl_->PrepareTiles();
       layer_tree_host_impl_->SynchronouslyInitializeAllTiles();
     }
 
     DoAnimate();
 
     LayerTreeHostImpl::FrameData frame;
     DoComposite(frame_begin_time, &frame);
 
     // DoComposite could abort, but because this is a synchronous composite
     // another draw will never be scheduled, so break remaining promises.
     layer_tree_host_impl_->active_tree()->BreakSwapPromises(
         SwapPromise::SWAP_FAILS);
+
+    layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
   }
 }
 
 void SingleThreadProxy::AsValueInto(base::debug::TracedValue* state) const {
   // The following line casts away const modifiers because it is just
   // setting debug state. We still want the AsValue() function and its
   // call chain to be const throughout.
   DebugScopedSetImplThread impl(const_cast<SingleThreadProxy*>(this));
 
   state->BeginDictionary("layer_tree_host_impl");
@@ skipping 54 matching lines @@
     timing_history_.DidStartDrawing();
 
     draw_result = layer_tree_host_impl_->PrepareToDraw(frame);
     draw_frame = draw_result == DRAW_SUCCESS;
     if (draw_frame)
       layer_tree_host_impl_->DrawLayers(frame, frame_begin_time);
     layer_tree_host_impl_->DidDrawAllLayers(*frame);
 
     bool start_ready_animations = draw_frame;
     layer_tree_host_impl_->UpdateAnimationState(start_ready_animations);
-    layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
 
     timing_history_.DidFinishDrawing();
   }
 
   if (draw_frame) {
     DebugScopedSetImplThread impl(this);
 
     // This CapturePostTasks should be destroyed before
     // DidCommitAndDrawFrame() is called since that goes out to the
     // embedder,
@@ skipping 190 matching lines @@
 
 void SingleThreadProxy::DidBeginImplFrameDeadline() {
   layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
 }
 
 void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc