Make SingleThreadProxy a SchedulerClient

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 6b781cb60ef6f8989577521f22ca4df5e63ead2a..b4b64791629608269688f5b68942194e56e6a330 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -91,8 +91,8 @@ class LayerTreeHostTestSetNeedsCommit1 : public LayerTreeHostTest {
   }
 
   virtual void AfterTest() OVERRIDE {
-    EXPECT_GE(1, num_commits_);
-    EXPECT_GE(1, num_draws_);
+    EXPECT_LE(1, num_commits_);
+    EXPECT_LE(1, num_draws_);
   }
 
  private:
@@ -1966,7 +1966,7 @@ class LayerTreeHostTestDeferCommits : public LayerTreeHostTest {
   int num_complete_commits_;
 };
 
-MULTI_THREAD_TEST_F(LayerTreeHostTestDeferCommits);
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestDeferCommits);
 
 class LayerTreeHostWithProxy : public LayerTreeHost {
  public:
@@ -4632,7 +4632,8 @@ class LayerTreeHostTestHighResRequiredAfterEvictingUIResources
 };
 
 // This test is flaky, see http://crbug.com/386199
-//MULTI_THREAD_TEST_F(LayerTreeHostTestHighResRequiredAfterEvictingUIResources);
+// MULTI_THREAD_TEST_F(
+//     LayerTreeHostTestHighResRequiredAfterEvictingUIResources);
 
 class LayerTreeHostTestGpuRasterizationDefault : public LayerTreeHostTest {
  protected: