cc: Adding DidFinishImplFrame to LTHI.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 1c602b9b944708a3d63a9f83262bc2814f1f16b0..eea6236ab6280627eba8b0e6a3e251c90781b26d 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1671,7 +1671,12 @@ bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
 void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
   // Sample the frame time now. This time will be used for updating animations
   // when we draw.
-  UpdateCurrentBeginFrameArgs(args);
+  DCHECK(!current_begin_frame_args_.IsValid());
+  current_begin_frame_args_ = args;
+  // TODO(mithro): Stop overriding the frame time once the usage of frame
+  // timing is unified.
+  current_begin_frame_args_.frame_time = gfx::FrameTime::Now();
+
   // Cache the begin impl frame interval
   begin_impl_frame_interval_ = args.interval;
 
@@ -1686,6 +1691,11 @@ void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
     it->OnBeginFrame(args);
 }
 
+void LayerTreeHostImpl::DidFinishImplFrame() {
+  DCHECK(current_begin_frame_args_.IsValid());
+  current_begin_frame_args_ = BeginFrameArgs();
+}
+
 void LayerTreeHostImpl::UpdateViewportContainerSizes() {
   LayerImpl* inner_container = active_tree_->InnerViewportContainerLayer();
   LayerImpl* outer_container = active_tree_->OuterViewportContainerLayer();
@@ -3133,19 +3143,6 @@ TreePriority LayerTreeHostImpl::GetTreePriority() const {
   return global_tile_state_.tree_priority;
 }
 
-void LayerTreeHostImpl::UpdateCurrentBeginFrameArgs(
-    const BeginFrameArgs& args) {
-  DCHECK(!current_begin_frame_args_.IsValid());
-  current_begin_frame_args_ = args;
-  // TODO(skyostil): Stop overriding the frame time once the usage of frame
-  // timing is unified.
-  current_begin_frame_args_.frame_time = gfx::FrameTime::Now();
-}
-
-void LayerTreeHostImpl::ResetCurrentBeginFrameArgsForNextFrame() {
-  current_begin_frame_args_ = BeginFrameArgs();
-}
-
 BeginFrameArgs LayerTreeHostImpl::CurrentBeginFrameArgs() const {
   // Try to use the current frame time to keep animations non-jittery.  But if
   // we're not in a frame (because this is during an input event or a delayed