cc: Create a Region class that wraps SkRegion, to replace use of WebCore::Region.

cc/test/layer_test_common.cc

 // Copyright 2012 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 "config.h"
 
 #include "cc/test/layer_test_common.h"
 
-#include "Region.h"
 #include "cc/draw_quad.h"
 #include "cc/math_util.h"
+#include "cc/region.h"
 #include "cc/render_pass.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace LayerTestCommon {
 
 // Align with expected and actual output
@@ skipping 28 matching lines @@
 
         EXPECT_TRUE(rect.Contains(quadRect)) << quadString << i;
         EXPECT_TRUE(remaining.Contains(quadRect)) << quadString << i;
         remaining.Subtract(quadRect);
     }
 
     EXPECT_TRUE(remaining.IsEmpty());
 }
 
 }  // namespace LayerTestCommon