Add layerTreeBuildHelper to control layer tree in ContentViewRenderView

content/public/browser/android/layer_tree_build_helper.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 CONTENT_PUBLIC_BROWSER_ANDROID_LAYER_TREE_BUILD_HELPER_H_
+#define CONTENT_PUBLIC_BROWSER_ANDROID_LAYER_TREE_BUILD_HELPER_H_
+
+#include "base/memory/ref_counted.h"
+
+namespace cc {
+class Layer;
+}
+
+namespace content {
+
+// A Helper class to build a layer tree to be composited
+// given a content root layer.
+class LayerTreeBuildHelper {
+ public:
+

[Yaron, 2014/04/24 19:47:11]

nit: ws

[Yusuf, 2014/04/28 23:18:46]

Done.

+  LayerTreeBuildHelper();
+
+  virtual scoped_refptr<cc::Layer> GetLayerTree(
+      scoped_refptr<cc::Layer> content_root_layer) = 0;
+
+ protected:
+  virtual ~LayerTreeBuildHelper();
+  scoped_refptr<cc::Layer> root_layer_;

[Yaron, 2014/04/24 19:47:11]

Move to impl.

+
+  DISALLOW_COPY_AND_ASSIGN(LayerTreeBuildHelper);
+};
+
+}
+
+#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_LAYER_TREE_BUILD_HELPER_H_