cc: Stop converting update rect from int to float to int.

cc/layers/solid_color_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_SOLID_COLOR_SCROLLBAR_LAYER_H_
 #define CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/scrollbar_layer_interface.h"
@@ skipping 13 matching lines @@
       bool is_left_side_vertical_scrollbar,
       int scroll_layer_id);
 
   // Layer overrides.
   virtual bool OpacityCanAnimateOnImplThread() const override;
   virtual ScrollbarLayerInterface* ToScrollbarLayer() override;
 
   virtual void PushPropertiesTo(LayerImpl* layer) override;
   virtual void PushScrollClipPropertiesTo(LayerImpl* layer) override;
 
-  virtual void SetNeedsDisplayRect(const gfx::RectF&) override;
+  virtual void SetNeedsDisplayRect(const gfx::Rect& rect) override;
 
   // ScrollbarLayerInterface
   virtual int ScrollLayerId() const override;
   virtual void SetScrollLayer(int layer_id) override;
   virtual void SetClipLayer(int layer_id) override;
 
   virtual ScrollbarOrientation orientation() const override;
 
  protected:
   SolidColorScrollbarLayer(ScrollbarOrientation orientation,
@@ skipping 10 matching lines @@
   int thumb_thickness_;
   int track_start_;
   bool is_left_side_vertical_scrollbar_;
 
   DISALLOW_COPY_AND_ASSIGN(SolidColorScrollbarLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_