cc: Control defer_commits logic by Scheduler

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 80e9f114b9c3a96da2597ba5354c40a2bc3e66b1..0df615b7b40c507ee3adee8e88b222b7c3a5983d 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -460,8 +460,6 @@ class LayerTreeHostForTesting : public LayerTreeHost {
 
   void set_test_started(bool started) { test_started_ = started; }
 
-  void DidDeferCommit() override { test_hooks_->DidDeferCommit(); }
-
  private:
   LayerTreeHostForTesting(TestHooks* test_hooks,
                           LayerTreeHostClient* client,
@@ -524,6 +522,13 @@ void LayerTreeTest::EndTestAfterDelayMs(int delay_milliseconds) {
       base::TimeDelta::FromMilliseconds(delay_milliseconds));
 }
 
+void LayerTreeTest::PostSetDeferCommitsToMainThread(bool defer_commits) {
+  main_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&LayerTreeTest::DispatchSetDeferCommits,
+                 main_thread_weak_ptr_, defer_commits));
+}
+
 void LayerTreeTest::PostAddAnimationToMainThread(
     Layer* layer_to_receive_animation) {
   main_task_runner_->PostTask(
@@ -731,6 +736,12 @@ void LayerTreeTest::DispatchCompositeImmediately() {
     layer_tree_host_->Composite(gfx::FrameTime::Now());
 }
 
+void LayerTreeTest::DispatchSetDeferCommits(bool defer_commits) {
+  DCHECK(!proxy() || proxy()->IsMainThread());
+  if (layer_tree_host_)
+    layer_tree_host_->SetDeferCommits(defer_commits);
+}
+
 void LayerTreeTest::RunTest(bool threaded,
                             bool delegating_renderer,
                             bool impl_side_painting) {