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

webkit/plugins/ppapi/ppb_scrollbar_group_impl.cc

+// 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.
+
+#include "webkit/plugins/ppapi/ppb_scrollbar_group_impl.h"
+
+#include "base/logging.h"
+#include "ppapi/c/dev/ppb_scrollbar_group_dev.h"
+#include "ppapi/thunk/thunk.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebScrollbarGroup.h"
+#include "webkit/plugins/ppapi/common.h"
+#include "webkit/plugins/ppapi/plugin_module.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+
+using ppapi::thunk::PPB_ScrollbarGroup_API;
+using WebKit::WebScrollbarGroup;
+
+namespace webkit {
+namespace ppapi {
+
+PPB_ScrollbarGroup_Impl::PPB_ScrollbarGroup_Impl(PluginInstance* instance)
+    : Resource(instance) {
+  scrollbar_group_.reset(WebScrollbarGroup::create(instance->container()));
+}
+
+PPB_ScrollbarGroup_Impl::~PPB_ScrollbarGroup_Impl() {
+}
+
+PPB_ScrollbarGroup_API* PPB_ScrollbarGroup_Impl::AsPPB_ScrollbarGroup_API() {
+  return this;
+}
+
+WebKit::WebScrollbarGroup* PPB_ScrollbarGroup_Impl::GetWebScrollbarGroup() {
+  return scrollbar_group_.get();
+}
+
+}  // namespace ppapi
+}  // namespace webkit
+