Make a global enum to differentiate impl & proxy.

ppapi/proxy/ppp_input_event_proxy.cc

Index: ppapi/proxy/ppp_input_event_proxy.cc
diff --git a/ppapi/proxy/ppp_input_event_proxy.cc b/ppapi/proxy/ppp_input_event_proxy.cc
index cfce397403d9608be89d6ae20fdb3554954dcd40..c7d4a9ac12578c3e432fe18def3e7890e16080c4 100644
--- a/ppapi/proxy/ppp_input_event_proxy.cc
+++ b/ppapi/proxy/ppp_input_event_proxy.cc
@@ -97,7 +97,7 @@ bool PPP_InputEvent_Proxy::OnMessageReceived(const IPC::Message& msg) {
 void PPP_InputEvent_Proxy::OnMsgHandleInputEvent(PP_Instance instance,
                                                  const InputEventData& data) {
   scoped_refptr<PPB_InputEvent_Shared> resource(new PPB_InputEvent_Shared(
-      PPB_InputEvent_Shared::InitAsProxy(), instance, data));
+      OBJECT_IS_PROXY, instance, data));
   ppp_input_event_impl_->HandleInputEvent(instance, resource->pp_resource());
 }
 
@@ -106,7 +106,7 @@ void PPP_InputEvent_Proxy::OnMsgHandleFilteredInputEvent(
     const InputEventData& data,
     PP_Bool* result) {
   scoped_refptr<PPB_InputEvent_Shared> resource(new PPB_InputEvent_Shared(
-      PPB_InputEvent_Shared::InitAsProxy(), instance, data));
+      OBJECT_IS_PROXY, instance, data));
   *result = ppp_input_event_impl_->HandleInputEvent(instance,
                                                     resource->pp_resource());
 }