Coalesce async touch move events until the ack back from render

content/content_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 349 matching lines @@
       'common/indexed_db/indexed_db_key_range.h',
       'common/indexed_db/indexed_db_messages.h',
       'common/indexed_db/indexed_db_param_traits.cc',
       'common/indexed_db/indexed_db_param_traits.h',
       'common/input/did_overscroll_params.cc',
       'common/input/did_overscroll_params.h',
       'common/input/gesture_event_stream_validator.cc',
       'common/input/gesture_event_stream_validator.h',
       'common/input/input_event.cc',
       'common/input/input_event.h',
+      'common/input/input_event_ack.cc',
+      'common/input/input_event_ack.h',
       'common/input/input_event_stream_validator.cc',
       'common/input/input_event_stream_validator.h',
       'common/input/input_param_traits.cc',
       'common/input/input_param_traits.h',
       'common/input/scoped_web_input_event.cc',
       'common/input/scoped_web_input_event.h',
       'common/input/synthetic_gesture_packet.cc',
       'common/input/synthetic_gesture_packet.h',
       'common/input/synthetic_gesture_params.cc',
       'common/input/synthetic_gesture_params.h',
@@ skipping 673 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h',
       ],
     }],
   ],
 }