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

webkit/plugins/ppapi/ppb_scrollbar_group_impl.h

+// Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_PPB_SCROLLBAR_GROUP_IMPL_H_
+#define WEBKIT_PLUGINS_PPAPI_PPB_SCROLLBAR_GROUP_IMPL_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ppapi/thunk/ppb_scrollbar_group_api.h"
+#include "webkit/plugins/ppapi/resource.h"
+
+namespace WebKit {
+class WebScrollbarGroup;
+}
+
+namespace webkit {
+namespace ppapi {
+
+class PluginInstance;
+
+class PPB_ScrollbarGroup_Impl
+    : public Resource,
+      public ::ppapi::thunk::PPB_ScrollbarGroup_API {
+ public:
+  PPB_ScrollbarGroup_Impl(PluginInstance* instance);
+  virtual ~PPB_ScrollbarGroup_Impl();
+
+  // ResourceObjectBase override.
+  virtual PPB_ScrollbarGroup_API* AsPPB_ScrollbarGroup_API() OVERRIDE;
+
+  // Called by PluginInstance so that we can forward these events to WebKit.
+  void MouseEnteredContentArea();
+  void MouseMovedInContentArea();
+  void MouseExitedContentArea();
+  void WillStartLiveResize();
+  void ContentResized();
+  void WillEndLiveResize();
+
+  WebKit::WebScrollbarGroup* GetWebScrollbarGroup();
+
+ private:
+  scoped_ptr<WebKit::WebScrollbarGroup> scrollbar_group_;
+
+  DISALLOW_COPY_AND_ASSIGN(PPB_ScrollbarGroup_Impl);
+};
+
+}  // namespace ppapi
+}  // namespace webkit
+
+#endif  // WEBKIT_PLUGINS_PPAPI_PPB_SCROLLBAR_GROUP_IMPL_H_