Add HandleInputEventAck message to allow out-of-process plugins to respond to user gestures.

ppapi/proxy/ppp_input_event_proxy.cc

 // Copyright (c) 2012 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/ppp_input_event_proxy.h"
 
 #include <algorithm>
 
 #include "ppapi/c/ppp_input_event.h"
 #include "ppapi/proxy/host_dispatcher.h"
@@ skipping 83 matching lines @@
   return handled;
 }
 
 void PPP_InputEvent_Proxy::OnMsgHandleInputEvent(PP_Instance instance,
                                                  const InputEventData& data) {
   scoped_refptr<PPB_InputEvent_Shared> resource(new PPB_InputEvent_Shared(
       OBJECT_IS_PROXY, instance, data));
   CallWhileUnlocked(ppp_input_event_impl_->HandleInputEvent,
                     instance,
                     resource->pp_resource());
+  HandleInputEventAck(instance, data.event_time_stamp);
 }
 
 void PPP_InputEvent_Proxy::OnMsgHandleFilteredInputEvent(
     PP_Instance instance,
     const InputEventData& data,
     PP_Bool* result) {
   scoped_refptr<PPB_InputEvent_Shared> resource(new PPB_InputEvent_Shared(
       OBJECT_IS_PROXY, instance, data));
   *result = CallWhileUnlocked(ppp_input_event_impl_->HandleInputEvent,
                               instance,
                               resource->pp_resource());
+  HandleInputEventAck(instance, data.event_time_stamp);
+}
+
+void PPP_InputEvent_Proxy::HandleInputEventAck(
+    PP_Instance instance, PP_TimeTicks timestamp) {
+  PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
+  if (dispatcher) {
+    // Note that we're sending the message to the host PPB_InstanceProxy.
+    dispatcher->Send(new PpapiMsg_PPPInputEvent_HandleInputEvent_ACK(
+        API_ID_PPB_INSTANCE, instance, timestamp));
+  } else {
+    NOTREACHED();
+  }
 }
 
 }  // namespace proxy
 }  // namespace ppapi