cc: Defer first OutputSurface creation until client is ready

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 1e58dd9d9261ac4feca7fe9267b6323fbf9f8aa5..f774d9846eba44b30c9718844315c6411202f554 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -111,10 +111,6 @@ class LayerTreeTest : public testing::Test, public TestHooks {
  public:
   virtual ~LayerTreeTest();
 
-  virtual void AfterTest() = 0;
-  virtual void BeginTest() = 0;
-  virtual void SetupTree();
-
   virtual void EndTest();
   void EndTestAfterDelay(int delay_milliseconds);
 
@@ -155,6 +151,11 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   void DispatchComposite();
   void DispatchDidAddAnimation();
 
+  virtual void AfterTest() = 0;
+  virtual void WillBeginTest();
+  virtual void BeginTest() = 0;
+  virtual void SetupTree();
+
   virtual void RunTest(bool threaded,
                        bool delegating_renderer,
                        bool impl_side_painting);