webkit/ppapi: Notify the container when a plugin is accepting wheel events just like r143871.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index db418cce51b6df23abf3a3698c7259ff5d253aa8..9488d00d0249b5424980663469e0c10fbb83b1c2 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -563,6 +563,7 @@ bool PluginInstance::Initialize(WebPluginContainer* container,
   full_frame_ = full_frame;
 
   container_->setIsAcceptingTouchEvents(IsAcceptingTouchEvents());
+  container_->setWantsWheelEvents(IsAcceptingWheelEvents());
 
   SetGPUHistogram(delegate_->GetPreferences(), arg_names, arg_values);
 
@@ -669,6 +670,13 @@ bool PluginInstance::SendCompositionEventWithUnderlineInformationToPlugin(
   return handled;
 }
 
+void PluginInstance::RequestInputEventsHelper(uint32_t event_classes) {
+  if (event_classes & PP_INPUTEVENT_CLASS_TOUCH)
+    container_->setIsAcceptingTouchEvents(IsAcceptingTouchEvents());
+  if (event_classes & PP_INPUTEVENT_CLASS_WHEEL)
+    container_->setWantsWheelEvents(IsAcceptingWheelEvents());
+}
+
 bool PluginInstance::HandleCompositionStart(const string16& text) {
   return SendCompositionEventToPlugin(PP_INPUTEVENT_TYPE_IME_COMPOSITION_START,
                                       text);
@@ -1176,6 +1184,11 @@ bool PluginInstance::IsAcceptingTouchEvents() const {
       (input_event_mask_ & PP_INPUTEVENT_CLASS_TOUCH);
 }
 
+bool PluginInstance::IsAcceptingWheelEvents() const {
+  return (filtered_input_event_mask_ & PP_INPUTEVENT_CLASS_WHEEL) ||
+      (input_event_mask_ & PP_INPUTEVENT_CLASS_WHEEL);
+}
+
 void PluginInstance::ScheduleAsyncDidChangeView() {
   if (view_change_weak_ptr_factory_.HasWeakPtrs())
     return;  // Already scheduled.
@@ -2138,8 +2151,7 @@ int32_t PluginInstance::RequestInputEvents(PP_Instance instance,
                                            uint32_t event_classes) {
   input_event_mask_ |= event_classes;
   filtered_input_event_mask_ &= ~(event_classes);
-  if (event_classes & PP_INPUTEVENT_CLASS_TOUCH)
-    container_->setIsAcceptingTouchEvents(IsAcceptingTouchEvents());
+  RequestInputEventsHelper(event_classes);
   return ValidateRequestInputEvents(false, event_classes);
 }
 
@@ -2147,8 +2159,7 @@ int32_t PluginInstance::RequestFilteringInputEvents(PP_Instance instance,
                                                     uint32_t event_classes) {
   filtered_input_event_mask_ |= event_classes;
   input_event_mask_ &= ~(event_classes);
-  if (event_classes & PP_INPUTEVENT_CLASS_TOUCH)
-    container_->setIsAcceptingTouchEvents(IsAcceptingTouchEvents());
+  RequestInputEventsHelper(event_classes);
   return ValidateRequestInputEvents(true, event_classes);
 }
 
@@ -2156,8 +2167,7 @@ void PluginInstance::ClearInputEventRequest(PP_Instance instance,
                                             uint32_t event_classes) {
   input_event_mask_ &= ~(event_classes);
   filtered_input_event_mask_ &= ~(event_classes);
-  if (event_classes & PP_INPUTEVENT_CLASS_TOUCH)
-    container_->setIsAcceptingTouchEvents(IsAcceptingTouchEvents());
+  RequestInputEventsHelper(event_classes);
 }
 
 void PluginInstance::ZoomChanged(PP_Instance instance, double factor) {