[WIP] Implement BackGroundFilter as seperate layer in cc

cc/layers/background_filter_layer.h

+// Copyright 2014 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_LAYERS_BACKGROUND_FILTER_LAYER_H_
+#define CC_LAYERS_BACKGROUND_FILTER_LAYER_H_
+
+#include "cc/base/cc_export.h"
+#include "cc/layers/layer.h"
+
+class FilterOperations;
+
+namespace cc {
+
+// A Layer that applies a filter effect to the background.
+// The filter is specified by using SetBackgroundFilters() on the base class.
+class CC_EXPORT BackgroundFilterLayer : public Layer {
+ public:
+  static scoped_refptr<BackgroundFilterLayer> Create();
+
+  virtual scoped_ptr<LayerImpl> CreateLayerImpl(
+      LayerTreeImpl* tree_impl) OVERRIDE;
+
+  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
+
+  void SetBackgroundFilters(const FilterOperations& filters);
+
+  void ApplyFilterAtRect(gfx::Rect src_filter_rect);
+
+  void DrawFilteredBackgroundAtRect(gfx::Rect draw_filter_rect);
+
+ protected:
+  BackgroundFilterLayer();
+
+ private:
+  virtual ~BackgroundFilterLayer();
+  gfx::Rect src_filter_rect_;
+  gfx::Rect draw_filter_rect_;
+  FilterOperations filter_operations_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFilterLayer);
+};
+
+}  // namespace cc
+#endif  // CC_LAYERS_BACKGROUND_FILTER_LAYER_H_