cc: Use multiple PrepareTiles approaches

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 01b3c69944a70df1f726cb8b71be956ffdd51f11..018821659ac6df6511a8b9e57cb49894c998729d 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -436,6 +436,11 @@ void SingleThreadProxy::NotifyReadyToDraw() {
     scheduler_on_impl_thread_->NotifyReadyToDraw();
 }
 
+void SingleThreadProxy::SetRequiresHighResToDraw(bool required) {
+  if (scheduler_on_impl_thread_)
+    scheduler_on_impl_thread_->SetRequiresHighResToDraw(required);
+}
+
 void SingleThreadProxy::SetNeedsRedrawOnImplThread() {
   client_->ScheduleComposite();
   if (scheduler_on_impl_thread_)
@@ -448,10 +453,10 @@ void SingleThreadProxy::SetNeedsAnimateOnImplThread() {
     scheduler_on_impl_thread_->SetNeedsAnimate();
 }
 
-void SingleThreadProxy::SetNeedsPrepareTilesOnImplThread() {
+void SingleThreadProxy::SetNeedsPrepareTilesOnImplThread(bool for_commit) {
   TRACE_EVENT0("cc", "SingleThreadProxy::SetNeedsPrepareTilesOnImplThread");
   if (scheduler_on_impl_thread_)
-    scheduler_on_impl_thread_->SetNeedsPrepareTiles();
+    scheduler_on_impl_thread_->SetNeedsPrepareTiles(for_commit);
 }
 
 void SingleThreadProxy::SetNeedsRedrawRectOnImplThread(
@@ -520,13 +525,6 @@ void SingleThreadProxy::DidActivateSyncTree() {
   timing_history_.DidActivateSyncTree();
 }
 
-void SingleThreadProxy::DidPrepareTiles() {
-  DCHECK(layer_tree_host_impl_->settings().impl_side_painting);
-  DCHECK(Proxy::IsImplThread());
-  if (scheduler_on_impl_thread_)
-    scheduler_on_impl_thread_->DidPrepareTiles();
-}
-
 void SingleThreadProxy::DidCompletePageScaleAnimationOnImplThread() {
   layer_tree_host_->DidCompletePageScaleAnimation();
 }