Change LayerHostImpl to use frame time from BeginFrameArgs rather than ::Now()

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 514 matching lines @@
 
     // We guard PrepareToDraw() with CanDraw() because it always returns a valid
     // frame, so can only be used when such a frame is possible. Since
     // DrawLayers() depends on the result of PrepareToDraw(), it is guarded on
     // CanDraw() as well.
     if (!ShouldComposite() || (for_readback && !can_do_readback)) {
       UpdateBackgroundAnimateTicking();
       return false;
     }
 
+    layer_tree_host_impl_->OverrideCurrentFrameTime(frame_begin_time);

[danakj, 2014/03/11 18:32:36]

This is really late, we'll have generated a frame for 1 time, then draw with
another time. I think this should be at the top of CommitAndComposite().

     layer_tree_host_impl_->Animate(
         layer_tree_host_impl_->CurrentFrameTimeTicks());
     UpdateBackgroundAnimateTicking();
 
     if (!layer_tree_host_impl_->IsContextLost()) {
       layer_tree_host_impl_->PrepareToDraw(frame, device_viewport_damage_rect);
       layer_tree_host_impl_->DrawLayers(frame, frame_begin_time);
       layer_tree_host_impl_->DidDrawAllLayers(*frame);
     }
     lost_output_surface = layer_tree_host_impl_->IsContextLost();
 
     bool start_ready_animations = true;
     layer_tree_host_impl_->UpdateAnimationState(start_ready_animations);
-
-    layer_tree_host_impl_->ResetCurrentFrameTimeForNextFrame();
   }
 
   if (lost_output_surface) {
     ContextProvider* offscreen_contexts =
         layer_tree_host_impl_->offscreen_context_provider();
     if (offscreen_contexts)
       offscreen_contexts->VerifyContexts();
     layer_tree_host_->DidLoseOutputSurface();
     return false;
   }
 
   return true;
 }
 
 void SingleThreadProxy::DidSwapFrame() {
   if (next_frame_is_newly_committed_frame_) {
     next_frame_is_newly_committed_frame_ = false;
     layer_tree_host_->DidCommitAndDrawFrame();
   }
 }
 
 bool SingleThreadProxy::CommitPendingForTesting() { return false; }
 
 }  // namespace cc