[WIP] Implement BackGroundFilter as seperate layer in cc

cc/layers/background_filter_layer_impl.cc

Index: cc/layers/background_filter_layer_impl.cc
diff --git a/cc/layers/background_filter_layer_impl.cc b/cc/layers/background_filter_layer_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..60a84d5aedc4815d5b302b0d0da41d29cb97fa76
--- /dev/null
+++ b/cc/layers/background_filter_layer_impl.cc
@@ -0,0 +1,59 @@
+// 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_impl.h"
+
+#include "cc/trees/occlusion_tracker.h"
+#include "cc/quads/filter_draw_quad.h"
+#include "cc/quads/render_pass.h"
+
+namespace cc {
+
+BackgroundFilterLayerImpl::BackgroundFilterLayerImpl(LayerTreeImpl* tree_impl,
+                                                     int id)
+    : LayerImpl(tree_impl, id), src_filter_rect_(), draw_filter_rect_() {
+}
+
+BackgroundFilterLayerImpl::~BackgroundFilterLayerImpl() {
+}
+
+scoped_ptr<LayerImpl> BackgroundFilterLayerImpl::CreateLayerImpl(
+    LayerTreeImpl* tree_impl) {
+  return BackgroundFilterLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
+}
+
+void BackgroundFilterLayerImpl::AppendQuads(
+    RenderPass* render_pass,
+    const OcclusionTracker<LayerImpl>& occlusion_tracker,
+    AppendQuadsData* append_quads_data) {
+  SharedQuadState* shared_quad_state =
+      render_pass->CreateAndAppendSharedQuadState();
+  PopulateSharedQuadState(shared_quad_state);
+
+  AppendDebugBorderQuad(
+      render_pass, content_bounds(), shared_quad_state, append_quads_data);
+
+  // get visible rect
+  gfx::Rect visible_content_rect = occlusion_tracker.UnoccludedContentRect(
+      src_filter_rect_, draw_properties().target_space_transform);
+
+  gfx::Rect draw_rect = occlusion_tracker.UnoccludedContentRect(
+    draw_filter_rect_, draw_properties().target_space_transform);
+
+  if (visible_content_rect.IsEmpty())
+    return;
+
+  FilterDrawQuad* quad = render_pass->CreateAndAppendDrawQuad<FilterDrawQuad>();
+  quad->SetNew(shared_quad_state,
+               visible_content_rect,
+               visible_content_rect,
+               draw_rect,
+               filter_operations_);
+}
+
+const char* BackgroundFilterLayerImpl::LayerTypeAsString() const {
+  return "cc::BackgroundFilterLayerImpl";
+}
+
+}  // namespace cc