[cc] Cleanup: Modify description of BitmapContentLayerUpdater

cc/resources/bitmap_content_layer_updater.h

 // Copyright 2011 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_BITMAP_CONTENT_LAYER_UPDATER_H_
 #define CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/resources/content_layer_updater.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 class SkCanvas;
 
 namespace cc {
 
 class LayerPainter;
 class RenderingStatsInstrumenation;
 
 // This class rasterizes the content_rect into a skia bitmap canvas. It then
-// updates textures by copying from the canvas into the texture, using
-// MapSubImage if possible.
+// creates a ResourceUpdate with this bitmap canvas and inserts the
+// ResourceBundle to the provided ResourceUpdateQueue. Actual texture uploading
+// is done by ResourceUpdateController.
 class CC_EXPORT BitmapContentLayerUpdater : public ContentLayerUpdater {
  public:
   class Resource : public LayerUpdater::Resource {
    public:
     Resource(BitmapContentLayerUpdater* updater,
              scoped_ptr<PrioritizedResource> resource);
     virtual ~Resource();
 
     virtual void Update(ResourceUpdateQueue* queue,
                         gfx::Rect source_rect,
@@ skipping 38 matching lines @@
   gfx::Size canvas_size_;
   bool opaque_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BitmapContentLayerUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_