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

ppapi/proxy/ppb_instance_proxy.h

Index: ppapi/proxy/ppb_instance_proxy.h
===================================================================
--- ppapi/proxy/ppb_instance_proxy.h	(revision 125463)
+++ ppapi/proxy/ppb_instance_proxy.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_time.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
@@ -64,7 +65,7 @@
                                          int32_t index) OVERRIDE;
   virtual PP_Var GetFontFamilies(PP_Instance instance) OVERRIDE;
   virtual PP_Bool SetFullscreen(PP_Instance instance,
-                                     PP_Bool fullscreen) OVERRIDE;
+                                PP_Bool fullscreen) OVERRIDE;
   virtual PP_Bool GetScreenSize(PP_Instance instance,
                                      PP_Size* size) OVERRIDE;
   virtual PP_Bool FlashIsFullscreen(PP_Instance instance) OVERRIDE;
@@ -80,6 +81,8 @@
                                               uint32_t event_classes) OVERRIDE;
   virtual void ClearInputEventRequest(PP_Instance instance,
                                       uint32_t event_classes) OVERRIDE;
+  virtual void ClosePendingUserGesture(PP_Instance instance,
+                                       PP_TimeTicks timestamp) OVERRIDE;
   virtual void ZoomChanged(PP_Instance instance, double factor) OVERRIDE;
   virtual void ZoomLimitsChanged(PP_Instance instance,
                                  double minimum_factor,
@@ -140,6 +143,8 @@
                                    uint32_t event_classes);
   void OnHostMsgClearInputEvents(PP_Instance instance,
                                  uint32_t event_classes);
+  void OnMsgHandleInputEventAck(PP_Instance instance,
+                                PP_TimeTicks timestamp);
   void OnHostMsgPostMessage(PP_Instance instance,
                             SerializedVarReceiveInput message);
   void OnHostMsgLockMouse(PP_Instance instance);