cc: Don't draw and swap if the frame will not change.

cc/test/layer_tree_test.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_LAYER_TREE_TEST_H_
 #define CC_TEST_LAYER_TREE_TEST_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "cc/base/thread.h"
@@ skipping 12 matching lines @@
 class LayerTreeHost;
 class LayerTreeHostClient;
 class LayerTreeHostImpl;
 
 // Used by test stubs to notify the test when something interesting happens.
 class TestHooks : public WebKit::WebAnimationDelegate {
  public:
   TestHooks();
   virtual ~TestHooks();
 
+  void ReadSettings(const LayerTreeSettings& settings);
+
   virtual void BeginCommitOnThread(LayerTreeHostImpl* host_impl) {}
   virtual void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) {}
   virtual void TreeActivatedOnThread(LayerTreeHostImpl* host_impl) {}
   virtual void InitializedRendererOnThread(LayerTreeHostImpl* host_impl,
                                            bool success) {}
   virtual bool PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                      LayerTreeHostImpl::FrameData* frame_data,
                                      bool result);
   virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) {}
   virtual void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) {}
@@ skipping 135 matching lines @@
   TEST_F(TEST_FIXTURE_NAME, RunMultiThread) {             \
     RunTest(true);                                        \
   }                                                       \
   class MultiThreadNeedsSemicolon##TEST_FIXTURE_NAME {}
 
 #define SINGLE_AND_MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME) \
   SINGLE_THREAD_TEST_F(TEST_FIXTURE_NAME);                \
   MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)
 
 #endif  // CC_TEST_LAYER_TREE_TEST_H_