Track plugin input event latency

ppapi/thunk/ppb_instance_api.h

 // 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.
 
 #ifndef PPAPI_THUNK_INSTANCE_API_H_
 #define PPAPI_THUNK_INSTANCE_API_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "ppapi/c/dev/ppb_url_util_dev.h"
@@ skipping 91 matching lines @@
       PP_Instance instance, SingletonResourceID id) = 0;
 
   // InputEvent.
   virtual int32_t RequestInputEvents(PP_Instance instance,
                                      uint32_t event_classes) = 0;
   virtual int32_t RequestFilteringInputEvents(PP_Instance instance,
                                               uint32_t event_classes) = 0;
   virtual void ClearInputEventRequest(PP_Instance instance,
                                       uint32_t event_classes) = 0;
 
+  // InputEventPrivate.
+  virtual void StartTrackingLatency(PP_Instance instance) = 0;
+
   // Messaging.
   virtual void PostMessage(PP_Instance instance, PP_Var message) = 0;
 
   // Mouse cursor.
   virtual PP_Bool SetCursor(PP_Instance instance,
                             PP_MouseCursor_Type type,
                             PP_Resource image,
                             const PP_Point* hot_spot) = 0;
 
   // MouseLock.
@@ skipping 71 matching lines @@
                                       PP_URLComponents_Dev* components) = 0;
 #endif  // !defined(OS_NACL)
 
   static const ApiID kApiID = API_ID_PPB_INSTANCE;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_INSTANCE_API_H_