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

ppapi/cpp/dev/scrollbar_dev.cc

 // Copyright (c) 2010 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 <vector>
 
 #include "ppapi/cpp/dev/scrollbar_dev.h"
 
+#include "ppapi/cpp/dev/scrollbar_group_dev.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 #include "ppapi/cpp/rect.h"
 
 namespace pp {
 
 namespace {
 
 template <> const char* interface_name<PPB_Scrollbar_Dev>() {
   return PPB_SCROLLBAR_DEV_INTERFACE;
 }
 
 }  // namespace
 
 Scrollbar_Dev::Scrollbar_Dev(PP_Resource resource) : Widget_Dev(resource) {
 }
 
-Scrollbar_Dev::Scrollbar_Dev(const Instance& instance, bool vertical) {
+Scrollbar_Dev::Scrollbar_Dev(const ScrollbarGroup_Dev& scrollbar_group,
+                             bool vertical) {
   if (!has_interface<PPB_Scrollbar_Dev>())
     return;
   PassRefFromConstructor(get_interface<PPB_Scrollbar_Dev>()->Create(
-      instance.pp_instance(), PP_FromBool(vertical)));
+      scrollbar_group.pp_resource(), PP_FromBool(vertical)));
 }
 
 Scrollbar_Dev::Scrollbar_Dev(const Scrollbar_Dev& other)
     : Widget_Dev(other) {
 }
 
 uint32_t Scrollbar_Dev::GetThickness() {
   if (!has_interface<PPB_Scrollbar_Dev>())
     return 0;
   return get_interface<PPB_Scrollbar_Dev>()->GetThickness(pp_resource());
 }
 
+bool Scrollbar_Dev::IsOverlay() {
+  if (!has_interface<PPB_Scrollbar_Dev>())
+    return false;
+  return
+      PP_ToBool(get_interface<PPB_Scrollbar_Dev>()->IsOverlay(pp_resource()));
+}
+
 uint32_t Scrollbar_Dev::GetValue() {
   if (!has_interface<PPB_Scrollbar_Dev>())
     return 0;
   return get_interface<PPB_Scrollbar_Dev>()->GetValue(pp_resource());
 }
 
 void Scrollbar_Dev::SetValue(uint32_t value) {
   if (has_interface<PPB_Scrollbar_Dev>())
     get_interface<PPB_Scrollbar_Dev>()->SetValue(pp_resource(), value);
 }
@@ skipping 17 matching lines @@
 }
 
 void Scrollbar_Dev::ScrollBy(PP_ScrollBy_Dev unit, int32_t multiplier) {
   if (has_interface<PPB_Scrollbar_Dev>())
     get_interface<PPB_Scrollbar_Dev>()->ScrollBy(pp_resource(),
                                                  unit,
                                                  multiplier);
 }
 
 }  // namespace pp