cc: Removing base::TimeTicks argument to DrawLayers as it isn't used.

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 1b1f6fc89852be3bb0a5e44a6e868b08b329ea2c..dc61d0335d17e47b195f763081e466f5762a6fab 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1457,9 +1457,10 @@ CompositorFrameMetadata LayerTreeHostImpl::MakeCompositorFrameMetadata() const {
   return metadata;
 }
 
-void LayerTreeHostImpl::DrawLayers(FrameData* frame,
-                                   base::TimeTicks frame_begin_time) {
+void LayerTreeHostImpl::DrawLayers(FrameData* frame) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::DrawLayers");
+
+  base::TimeTicks frame_begin_time = CurrentBeginFrameArgs().frame_time;

[danakj, 2015/04/24 17:24:22]

I think I prefer passing things to a function rather than pulling them out of
some state on the class when it's not troublesome to do so.

[danakj, 2015/04/24 17:24:46]

(Esp for such a complicated/huge class as this)

   DCHECK(CanDraw());
 
   if (!frame->composite_events.empty()) {