[WIP] Implement BackGroundFilter as seperate layer in cc

cc/layers/background_filter_layer.cc

+// 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.
+
+#include "cc/layers/background_filter_layer.h"
+#include "cc/layers/background_filter_layer_impl.h"
+
+namespace cc {
+
+scoped_ptr<LayerImpl> BackgroundFilterLayer::CreateLayerImpl(
+    LayerTreeImpl* tree_impl) {
+  return BackgroundFilterLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
+}
+
+scoped_refptr<BackgroundFilterLayer> BackgroundFilterLayer::Create() {
+  return make_scoped_refptr(new BackgroundFilterLayer());
+}
+
+BackgroundFilterLayer::BackgroundFilterLayer() : Layer() {
+}
+
+BackgroundFilterLayer::~BackgroundFilterLayer() {
+}
+
+void BackgroundFilterLayer::SetBackgroundFilters(
+    const FilterOperations& filters) {
+  filter_operations_ = filters;
+  SetNeedsCommit();
+}
+
+void BackgroundFilterLayer::ApplyFilterAtRect(gfx::Rect src_filter_rect) {
+  if (src_filter_rect_ == src_filter_rect)
+    return;
+
+  src_filter_rect_ = src_filter_rect;
+  SetNeedsCommit();
+}
+
+void BackgroundFilterLayer::DrawFilteredBackgroundAtRect(
+    gfx::Rect draw_filter_rect) {
+  if (draw_filter_rect_ == draw_filter_rect)
+    return;
+
+  draw_filter_rect_ = draw_filter_rect;
+  SetNeedsCommit();
+}
+
+void BackgroundFilterLayer::PushPropertiesTo(LayerImpl* layer) {
+  Layer::PushPropertiesTo(layer);
+  BackgroundFilterLayerImpl* layer_impl =
+      static_cast<BackgroundFilterLayerImpl*>(layer);
+
+  layer_impl->ApplyFilterAtRect(src_filter_rect_);
+  layer_impl->DrawFilteredBackgroundAtRect(draw_filter_rect_);
+  layer_impl->SetBackgroundFilters(filter_operations_);
+}
+
+}  // namespace cc