Standardize usage of virtual/override/final in cc/

cc/resources/picture_pile_unittest.cc

 // Copyright 2013 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.
 
 #include <map>
 #include <utility>
 
 #include "cc/resources/picture_pile.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_rendering_stats_instrumentation.h"
@@ skipping 15 matching lines @@
 
   bool CanRasterLayerRect(const gfx::Rect& layer_rect) {
     return CanRaster(1.f, layer_rect);
   }
 
   typedef PicturePile::PictureInfo PictureInfo;
   typedef PicturePile::PictureMapKey PictureMapKey;
   typedef PicturePile::PictureMap PictureMap;
 
  protected:
-    virtual ~TestPicturePile() {}
+  ~TestPicturePile() override {}
 };
 
 class PicturePileTestBase {
  public:
   PicturePileTestBase()
       : background_color_(SK_ColorBLUE),
         min_scale_(0.125),
         frame_number_(0),
         contents_opaque_(false) {}
 
@@ skipping 1382 matching lines @@
   client_.add_draw_rect(tiling_rect(), paint);
   client_.add_draw_rect(tiling_rect(), paint);
   client_.add_draw_rect(tiling_rect(), paint);
   Region invalidation5(tiling_rect());
   UpdateAndExpandInvalidation(&invalidation5, tiling_size(), tiling_rect());
   EXPECT_FALSE(pile_->is_solid_color());
 }
 
 }  // namespace
 }  // namespace cc