Standardize usage of virtual/override/final specifiers in cc/.

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/animation/animation_delegate.h"
@@ skipping 114 matching lines @@
 // tree host is initialized.
 //
 // Key stages of the drawing loop, e.g. drawing or commiting, redirect to
 // LayerTreeTest methods of similar names. To track the commit process, override
 // these functions.
 //
 // The test continues until someone calls EndTest. EndTest can be called on any
 // thread, but be aware that ending the test is an asynchronous process.
 class LayerTreeTest : public testing::Test, public TestHooks {
  public:
-  virtual ~LayerTreeTest();
+  ~LayerTreeTest() override;
 
   virtual void EndTest();
   void EndTestAfterDelayMs(int delay_milliseconds);
 
   void PostAddAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddInstantAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddLongAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostSetNeedsCommitToMainThread();
   void PostSetNeedsUpdateLayersToMainThread();
   void PostSetNeedsRedrawToMainThread();
@@ skipping 222 matching lines @@
   SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(TEST_FIXTURE_NAME); \
   SINGLE_AND_MULTI_THREAD_DELEGATING_RENDERER_TEST_F(TEST_FIXTURE_NAME)
 
 // Some tests want to control when notify ready for activation occurs,
 // but this is not supported in the single-threaded case.
 #define SINGLE_AND_MULTI_THREAD_BLOCKNOTIFY_TEST_F(TEST_FIXTURE_NAME) \
   SINGLE_THREAD_NOIMPL_TEST_F(TEST_FIXTURE_NAME);                     \
   MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)
 
 #endif  // CC_TEST_LAYER_TREE_TEST_H_