Track plugin input event latency

ppapi/ppapi_shared.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'ppapi_shared_target': 0,
     },
     'target_conditions': [
@@ skipping 187 matching lines @@
           'thunk/ppb_graphics_3d_api.h',
           'thunk/ppb_graphics_3d_thunk.cc',
           'thunk/ppb_host_resolver_api.h',
           'thunk/ppb_host_resolver_thunk.cc',
           'thunk/ppb_host_resolver_private_api.h',
           'thunk/ppb_host_resolver_private_thunk.cc',
           'thunk/ppb_image_data_api.h',
           'thunk/ppb_image_data_thunk.cc',
           'thunk/ppb_input_event_api.h',
           'thunk/ppb_input_event_thunk.cc',
+          'thunk/ppb_input_event_private_thunk.cc',
           'thunk/ppb_instance_api.h',
           'thunk/ppb_instance_private_thunk.cc',
           'thunk/ppb_instance_thunk.cc',
           'thunk/ppb_isolated_file_system_private_api.h',
           'thunk/ppb_isolated_file_system_private_thunk.cc',
           'thunk/ppb_media_stream_audio_track_api.h',
           'thunk/ppb_media_stream_audio_track_thunk.cc',
           'thunk/ppb_media_stream_video_track_api.h',
           'thunk/ppb_media_stream_video_track_thunk.cc',
           'thunk/ppb_message_loop_api.h',
@@ skipping 128 matching lines @@
               'thunk/ppb_tcp_socket_private_thunk.cc',
               'thunk/ppb_udp_socket_private_thunk.cc',
               'thunk/ppb_x509_certificate_private_thunk.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }