cc: Block commit on activate by setting a flag on LayerTreeHost.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index f18e3b865409bd20d0c17468d03396cca14c09b0..27659e054bea869e8bcc1940036e2f5d82fead9b 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -518,6 +518,10 @@ bool LayerTreeHost::CommitRequested() const {
   return proxy_->CommitRequested();
 }
 
+void LayerTreeHost::SetNextCommitWaitsForActivation() {
+  proxy_->SetNextCommitWaitsForActivation();
+}
+
 void LayerTreeHost::SetAnimationEvents(scoped_ptr<AnimationEventsVector> events,
                                        base::Time wall_clock_time) {
   DCHECK(proxy_->IsMainThread());
@@ -1089,12 +1093,6 @@ void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
                  animate));
 }
 
-bool LayerTreeHost::BlocksPendingCommit() const {
-  if (!root_layer_.get())
-    return false;
-  return root_layer_->BlocksPendingCommitRecursive();
-}
-
 scoped_ptr<base::Value> LayerTreeHost::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
   state->Set("proxy", proxy_->AsValue().release());