cc: Add a pixel test for background blur outsets.

cc/test/layer_tree_pixel_test.h

 // 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 "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/test/layer_tree_test.h"
 
 #ifndef CC_TEST_LAYER_TREE_PIXEL_TEST_H_
 #define CC_TEST_LAYER_TREE_PIXEL_TEST_H_
 
 namespace cc {
 class LayerTreeHost;
+class PixelComparator;
 
 class LayerTreePixelTest : public LayerTreeTest {
  protected:
   LayerTreePixelTest();
   virtual ~LayerTreePixelTest();
 
   virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE;
   virtual scoped_refptr<cc::ContextProvider>
       OffscreenContextProviderForMainThread() OVERRIDE;
   virtual scoped_refptr<cc::ContextProvider>
       OffscreenContextProviderForCompositorThread() OVERRIDE;
   virtual void SwapBuffersOnThread(LayerTreeHostImpl* host_impl,
                                    bool result) OVERRIDE;
 
   virtual void BeginTest() OVERRIDE;
   virtual void SetupTree() OVERRIDE;
   virtual void AfterTest() OVERRIDE;
 
   scoped_refptr<SolidColorLayer> CreateSolidColorLayer(gfx::Rect rect,
                                                        SkColor color);
+  scoped_refptr<SolidColorLayer> CreateSolidColorLayerWithBorder(
+      gfx::Rect rect,
+      SkColor color,
+      int border_width,
+      SkColor border_color);
 
   void RunPixelTest(scoped_refptr<Layer> content_root,
                     base::FilePath file_name);
 
   // Common CSS colors defined for tests to use.
   enum Colors {
     kCSSOrange = 0xffffa500,
     kCSSBrown = 0xffa52a2a,
     kCSSGreen = 0xff008000,
   };
 
+  scoped_ptr<PixelComparator> pixel_comparator_;
+
  private:
   scoped_refptr<Layer> content_root_;
   base::FilePath ref_file_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_LAYER_TREE_PIXEL_TEST_H_