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

webkit/plugins/ppapi/ppb_scrollbar_impl.cc

Index: webkit/plugins/ppapi/ppb_scrollbar_impl.cc
===================================================================
--- webkit/plugins/ppapi/ppb_scrollbar_impl.cc	(revision 95011)
+++ webkit/plugins/ppapi/ppb_scrollbar_impl.cc	(working copy)
@@ -48,10 +48,14 @@
   return ::ppapi::thunk::GetPPB_Scrollbar_Thunk()->IsScrollbar(resource);
 }
 
-uint32_t GetThickness() {
+uint32_t GetThickness3() {
   return WebScrollbar::defaultThickness();
 }
 
+uint32_t GetThickness4(PP_Resource resource) {
+  return ::ppapi::thunk::GetPPB_Scrollbar_Thunk()->GetThickness(resource);
+}
+
 uint32_t GetValue(PP_Resource resource) {
   return ::ppapi::thunk::GetPPB_Scrollbar_Thunk()->GetValue(resource);
 }
@@ -82,7 +86,7 @@
 const PPB_Scrollbar_0_3_Dev ppb_scrollbar_0_3 = {
   &Create,
   &IsScrollbar,
-  &GetThickness,
+  &GetThickness3,
   &GetValue,
   &SetValue,
   &SetDocumentSize,
@@ -90,6 +94,17 @@
   &ScrollBy
 };
 
+const PPB_Scrollbar_0_4_Dev ppb_scrollbar_0_4 = {
+  &Create,
+  &IsScrollbar,
+  &GetThickness4,
+  &GetValue,
+  &SetValue,
+  &SetDocumentSize,
+  &SetTickMarks,
+  &ScrollBy
+};
+
 }  // namespace
 
 PPB_Scrollbar_Impl::PPB_Scrollbar_Impl(PluginInstance* instance, bool vertical)
@@ -111,10 +126,19 @@
   return &ppb_scrollbar_0_3;
 }
 
+// static
+const PPB_Scrollbar_0_4_Dev* PPB_Scrollbar_Impl::Get0_4Interface() {
+  return &ppb_scrollbar_0_4;
+}
+
 uint32_t PPB_Scrollbar_Impl::GetThickness() {
   return WebScrollbar::defaultThickness();
 }
 
+bool PPB_Scrollbar_Impl::IsOverlay() {
+  return scrollbar_->isOverlay();
+}
+
 uint32_t PPB_Scrollbar_Impl::GetValue() {
   return scrollbar_->value();
 }
@@ -204,6 +228,18 @@
       instance()->pp_instance(), resource.id, scrollbar_->value());
 }
 
+void PPB_Scrollbar_Impl::overlayChanged(WebScrollbar* scrollbar) {
+  const PPP_Scrollbar_Dev* ppp_scrollbar =
+      static_cast<const PPP_Scrollbar_Dev*>(instance()->module()->
+          GetPluginInterface(PPP_SCROLLBAR_DEV_INTERFACE));
+  if (!ppp_scrollbar)
+    return;
+  ScopedResourceId resource(this);
+  ppp_scrollbar->OverlayChanged(
+      instance()->pp_instance(), resource.id,
+      PP_FromBool(scrollbar_->isOverlay()));
+}
+
 void PPB_Scrollbar_Impl::invalidateScrollbarRect(
     WebKit::WebScrollbar* scrollbar,
     const WebKit::WebRect& rect) {