Make a global enum to differentiate impl & proxy.

ppapi/proxy/ppb_testing_proxy.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 "ppapi/proxy/ppb_testing_proxy.h"
 
 #include "base/message_loop.h"
 #include "ppapi/c/dev/ppb_testing_dev.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
@@ skipping 171 matching lines @@
 
 void PPB_Testing_Proxy::OnMsgGetLiveObjectsForInstance(PP_Instance instance,
                                                        uint32_t* result) {
   *result = ppb_testing_impl_->GetLiveObjectsForInstance(instance);
 }
 
 void PPB_Testing_Proxy::OnMsgSimulateInputEvent(
     PP_Instance instance,
     const InputEventData& input_event) {
   scoped_refptr<PPB_InputEvent_Shared> input_event_impl(
-      new PPB_InputEvent_Shared(PPB_InputEvent_Shared::InitAsProxy(),
-                                instance,
-                                input_event));
+      new PPB_InputEvent_Shared(OBJECT_IS_PROXY, instance, input_event));
   ppb_testing_impl_->SimulateInputEvent(instance,
                                         input_event_impl->pp_resource());
 }
 
 }  // namespace proxy
 }  // namespace ppapi