aura: Use Layer::SetShowPaintedContent to stop showing external content

ui/views/view.h

 // Copyright (c) 2012 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 UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 1048 matching lines @@
 
   // Override to paint a border not specified by SetBorder().
   virtual void OnPaintBorder(gfx::Canvas* canvas);
 
   // Override to paint a focus border not specified by set_focus_border() around
   // relevant contents.  The focus border is usually a dotted rectangle.
   virtual void OnPaintFocusBorder(gfx::Canvas* canvas);
 
   // Accelerated painting ------------------------------------------------------
 
-  // This creates a layer for the view, if one does not exist. It then
-  // passes the texture to a layer associated with the view. While an external
-  // texture is set, the view will not update the layer contents.
-  //
-  // |texture| cannot be NULL.
-  //
-  // Returns false if it cannot create a layer to which to assign the texture.
-  bool SetExternalTexture(ui::Texture* texture);
-
   // Returns the offset from this view to the nearest ancestor with a layer. If
   // |layer_parent| is non-NULL it is set to the nearest ancestor with a layer.
   virtual gfx::Vector2d CalculateOffsetToAncestorWithLayer(
       ui::Layer** layer_parent);
 
   // Updates the view's layer's parent. Called when a view is added to a view
   // hierarchy, responsible for parenting the view's layer to the enclosing
   // layer in the hierarchy.
   virtual void UpdateParentLayer();
 
@@ skipping 452 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_