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

cc/tiled_layer.cc

 // 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.
 
 #include "config.h"
 
 #include "cc/tiled_layer.h"
 
-#include "Region.h"
 #include "base/basictypes.h"
 #include "cc/geometry.h"
 #include "cc/layer_impl.h"
 #include "cc/layer_tree_host.h"
 #include "cc/overdraw_metrics.h"
 #include "cc/tiled_layer_impl.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "ui/gfx/rect_conversions.h"
 
 using namespace std;
@@ skipping 757 matching lines @@
     gfx::Rect prepaintRect = visibleContentRect();
     prepaintRect.Inset(-m_tiler->tileSize().width() * prepaintColumns,
                        -m_tiler->tileSize().height() * prepaintRows);
     gfx::Rect contentRect(gfx::Point(), contentBounds());
     prepaintRect.Intersect(contentRect);
 
     return prepaintRect;
 }
 
 }  // namespace cc