Make SingleThreadProxy a SchedulerClient

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 2dbab111ce62705a5d15c2846d4466c06169c852..cd0de155d6f71d8693de5fc572f77b06698f1a11 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -331,7 +331,6 @@ LayerTreeTest::LayerTreeTest()
       end_when_begin_returns_(false),
       timed_out_(false),
       scheduled_(false),
-      schedule_when_set_visible_true_(false),
       started_(false),
       ended_(false),
       delegating_renderer_(false),
@@ -587,11 +586,6 @@ void LayerTreeTest::DispatchSetVisible(bool visible) {
     return;
 
   layer_tree_host_->SetVisible(visible);
-
-  // If the LTH is being made visible and a previous ScheduleComposite() was
-  // deferred because the LTH was not visible, re-schedule the composite now.
-  if (layer_tree_host_->visible() && schedule_when_set_visible_true_)
-    ScheduleComposite();
 }
 
 void LayerTreeTest::DispatchSetNextCommitForcesRedraw() {
@@ -607,16 +601,7 @@ void LayerTreeTest::DispatchComposite() {
   if (!layer_tree_host_)
     return;
 
-  // If the LTH is not visible, defer the composite until the LTH is made
-  // visible.
-  if (!layer_tree_host_->visible()) {
-    schedule_when_set_visible_true_ = true;
-    return;
-  }
-
-  schedule_when_set_visible_true_ = false;
-  base::TimeTicks now = gfx::FrameTime::Now();
-  layer_tree_host_->Composite(now);
+  layer_tree_host_->SetNeedsCommit();
 }
 
 void LayerTreeTest::RunTest(bool threaded,