Move scaling of ui resources for scrollbars to the time of upload

cc/layers/painted_scrollbar_layer.h

 // Copyright 2013 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_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
 #define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/input/scrollbar.h"
@@ skipping 54 matching lines @@
 
   template <typename T>
   bool UpdateProperty(T value, T* prop) {
     if (*prop == value)
       return false;
     *prop = value;
     SetNeedsPushProperties();
     return true;
   }
 
-  int MaxTextureSize();
-  float ClampScaleToMaxTextureSize(float scale);
-
   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
                                           const gfx::Rect& content_rect,
                                           ScrollbarPart part);
 
   std::unique_ptr<Scrollbar> scrollbar_;
   int scroll_layer_id_;
 
   float internal_contents_scale_;
   gfx::Size internal_content_bounds_;
 
@@ skipping 10 matching lines @@
   std::unique_ptr<ScopedUIResource> thumb_resource_;
 
   float thumb_opacity_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_