Refactor cc scrollbar layers to separate solid-color vs desktop.

cc/layers/scrollbar_layer_impl.h

 // Copyright 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 CC_LAYERS_SCROLLBAR_LAYER_IMPL_H_
 #define CC_LAYERS_SCROLLBAR_LAYER_IMPL_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/input/scrollbar.h"
-#include "cc/layers/layer_impl.h"
+#include "cc/layers/scrollbar_layer_impl_base.h"
 #include "cc/resources/ui_resource_client.h"
 
 namespace cc {
 
 class LayerTreeImpl;
 class ScrollView;
 
-class CC_EXPORT ScrollbarLayerImpl : public LayerImpl {
+class CC_EXPORT ScrollbarLayerImpl : public ScrollbarLayerImplBase {
  public:
   static scoped_ptr<ScrollbarLayerImpl> Create(
       LayerTreeImpl* tree_impl,
       int id,
       ScrollbarOrientation orientation);
   virtual ~ScrollbarLayerImpl();
 
   // LayerImpl implementation.
-  virtual ScrollbarLayerImpl* ToScrollbarLayer() OVERRIDE;
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 
   virtual bool WillDraw(DrawMode draw_mode,
                         ResourceProvider* resource_provider) OVERRIDE;
   virtual void AppendQuads(QuadSink* quad_sink,
                            AppendQuadsData* append_quads_data) OVERRIDE;
 
-  int scroll_layer_id() const { return scroll_layer_id_; }
-  void set_scroll_layer_id(int id) { scroll_layer_id_ = id; }
-
-  ScrollbarOrientation Orientation() const;
-  float CurrentPos() const;
-  int Maximum() const;
+  virtual void DidLoseOutputSurface() OVERRIDE;
 
   void SetThumbThickness(int thumb_thickness);
   int thumb_thickness() const { return thumb_thickness_; }
   void SetThumbLength(int thumb_length);
   void SetTrackStart(int track_start);
   void SetTrackLength(int track_length);
-  void SetVerticalAdjust(float vertical_adjust);
+
   void set_track_ui_resource_id(UIResourceId uid) {
     track_ui_resource_id_ = uid;
   }
   void set_thumb_ui_resource_id(UIResourceId uid) {
     thumb_ui_resource_id_ = uid;
   }
-  void SetVisibleToTotalLengthRatio(float ratio);
-  void set_is_overlay_scrollbar(bool is_overlay_scrollbar) {
-    is_overlay_scrollbar_ = is_overlay_scrollbar;
-  }
-  bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
-
-  void SetCurrentPos(float current_pos);
-  void SetMaximum(int maximum);
-
-  gfx::Rect ComputeThumbQuadRect() const;
 
  protected:
   ScrollbarLayerImpl(LayerTreeImpl* tree_impl,
                      int id,
                      ScrollbarOrientation orientation);
 
+  // ScrollbarLayerImplBase implementation.
+  virtual int ThumbThickness() const OVERRIDE;
+  virtual int ThumbLength() const OVERRIDE;
+  virtual float TrackLength() const OVERRIDE;
+  virtual int TrackStart() const OVERRIDE;
+
  private:
   virtual const char* LayerTypeAsString() const OVERRIDE;
 
-  gfx::Rect ScrollbarLayerRectToContentRect(gfx::RectF layer_rect) const;
-
   UIResourceId track_ui_resource_id_;
   UIResourceId thumb_ui_resource_id_;
 
-  float current_pos_;
-  int maximum_;
   int thumb_thickness_;
   int thumb_length_;
   int track_start_;
   int track_length_;
-  ScrollbarOrientation orientation_;
 
   // Difference between the clip layer's height and the visible viewport
   // height (which may differ in the presence of top-controls hiding).
   float vertical_adjust_;
 
-  float visible_to_total_length_ratio_;
-
   int scroll_layer_id_;
 
-  bool is_overlay_scrollbar_;
-
   DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImpl);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_H_