[cc] Unify static create method of ResourceUpdate

cc/resources/skpicture_content_layer_updater.h

-// Copyright 2011 The Chromium Authors. All rights reserved.
+// 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_RESOURCES_SKPICTURE_CONTENT_LAYER_UPDATER_H_
 #define CC_RESOURCES_SKPICTURE_CONTENT_LAYER_UPDATER_H_
 
 #include "cc/resources/content_layer_updater.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 class SkCanvas;
 
 namespace cc {
 
 class LayerPainter;
 
-// This class records the content_rect into an SkPicture. Subclasses, provide
-// different implementations of tile updating based on this recorded picture.
-// The BitmapSkPictureContentLayerUpdater and
-// FrameBufferSkPictureContentLayerUpdater are two examples of such
-// implementations.
+// This class records the content_rect into an SkPicture. Subclass provides

[enne (OOO), 2014/01/08 17:51:45]

This looks unrelated to your change description.  Can you stick it in another
patch?

[simonhong, 2014/01/09 04:36:25]

Removed and sent out another cl.

+// SkCanvas to DrawPicture() for tile updating based on this recorded picture.
 class SkPictureContentLayerUpdater : public ContentLayerUpdater {
  protected:
   SkPictureContentLayerUpdater(
       scoped_ptr<LayerPainter> painter,
       RenderingStatsInstrumentation* stats_instrumentation,
       int layer_id);
   virtual ~SkPictureContentLayerUpdater();
 
   virtual void PrepareToUpdate(gfx::Rect content_rect,
                                gfx::Size tile_size,
                                float contents_width_scale,
                                float contents_height_scale,
                                gfx::Rect* resulting_opaque_rect) OVERRIDE;
   void DrawPicture(SkCanvas* canvas);
 
  private:
   // Recording canvas.
   SkPicture picture_;
 
   DISALLOW_COPY_AND_ASSIGN(SkPictureContentLayerUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_SKPICTURE_CONTENT_LAYER_UPDATER_H_