Pepper and WebKit API change to support a plugin knowing if a scrollbar is an overlay one.

webkit/plugins/ppapi/ppb_scrollbar_impl.h

Index: webkit/plugins/ppapi/ppb_scrollbar_impl.h
===================================================================
--- webkit/plugins/ppapi/ppb_scrollbar_impl.h	(revision 95773)
+++ webkit/plugins/ppapi/ppb_scrollbar_impl.h	(working copy)
@@ -16,25 +16,24 @@
 namespace webkit {
 namespace ppapi {
 
+class PPB_ScrollbarGroup_Impl;
 class PluginInstance;
 
 class PPB_Scrollbar_Impl : public PPB_Widget_Impl,
                            public ::ppapi::thunk::PPB_Scrollbar_API,
                            public WebKit::WebScrollbarClient {
  public:
-  PPB_Scrollbar_Impl(PluginInstance* instance, bool vertical);
+  static PP_Resource Create(PP_Resource scrollbar_group,
+                            bool vertical);
+
   virtual ~PPB_Scrollbar_Impl();
 
   // ResourceObjectBase override.
   virtual PPB_Scrollbar_API* AsPPB_Scrollbar_API() OVERRIDE;
 
-  // Returns a pointer to the interface implementing PPB_Scrollbar_0_3 that is
-  // exposed to the plugin. New code should use the thunk system for the new
-  // version of this API.
-  static const PPB_Scrollbar_0_3_Dev* Get0_3Interface();
-
   // PPB_Scrollbar_API implementation.
   virtual uint32_t GetThickness() OVERRIDE;
+  virtual bool IsOverlay() OVERRIDE;
   virtual uint32_t GetValue() OVERRIDE;
   virtual void SetValue(uint32_t value) OVERRIDE;
   virtual void SetDocumentSize(uint32_t size) OVERRIDE;
@@ -42,6 +41,9 @@
   virtual void ScrollBy(PP_ScrollBy_Dev unit, int32_t multiplier) OVERRIDE;
 
  private:
+  PPB_Scrollbar_Impl(PPB_ScrollbarGroup_Impl* group);
+  void Init(bool vertical);
+
   // PPB_Widget private implementation.
   virtual PP_Bool PaintInternal(const gfx::Rect& rect,
                                 PPB_ImageData_Impl* image) OVERRIDE;
@@ -51,6 +53,8 @@
 
   // WebKit::WebScrollbarClient implementation.
   virtual void valueChanged(WebKit::WebScrollbar* scrollbar) OVERRIDE;
+  // TODO(jam): add OVERRIDE once WebKit is rolled
+  virtual void overlayChanged(WebKit::WebScrollbar* scrollbar);
   virtual void invalidateScrollbarRect(WebKit::WebScrollbar* scrollbar,
                                        const WebKit::WebRect& rect) OVERRIDE;
   virtual void getTickmarks(
@@ -61,7 +65,8 @@
 
   gfx::Rect dirty_;
   std::vector<WebKit::WebRect> tickmarks_;
-  scoped_ptr<WebKit::WebScrollbar> scrollbar_;
+  scoped_refptr<PPB_ScrollbarGroup_Impl> scrollbar_group_;
+  scoped_ptr<WebKit::WebScrollbar> scrollbar_;  
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Scrollbar_Impl);
 };