Add subscribeUniform extension pipeline

gpu/command_buffer_service.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.
 
 {
   'include_dirs': [
     '..',
   ],
   'all_dependent_settings': {
     'include_dirs': [
@@ skipping 104 matching lines @@
     'command_buffer/service/shader_translator_cache.h',
     'command_buffer/service/shader_translator_cache.cc',
     'command_buffer/service/stream_texture_manager_in_process_android.h',
     'command_buffer/service/stream_texture_manager_in_process_android.cc',
     'command_buffer/service/texture_definition.h',
     'command_buffer/service/texture_definition.cc',
     'command_buffer/service/texture_manager.h',
     'command_buffer/service/texture_manager.cc',
     'command_buffer/service/transfer_buffer_manager.cc',
     'command_buffer/service/transfer_buffer_manager.h',
+    'command_buffer/service/uniform_subscription_manager.h',
+    'command_buffer/service/uniform_subscription_manager.cc',
     'command_buffer/service/vertex_array_manager.h',
     'command_buffer/service/vertex_array_manager.cc',
     'command_buffer/service/vertex_attrib_manager.h',
     'command_buffer/service/vertex_attrib_manager.cc',
   ],
   'conditions': [
     ['ui_compositor_image_transport==1', {
       'include_dirs': [
         '../third_party/khronos',
       ],
     }],
     ['OS in ("win", "android") or (OS == "linux" and use_x11 == 1)', {
       'sources': [
         'command_buffer/service/async_pixel_transfer_manager_egl.cc',
         'command_buffer/service/async_pixel_transfer_manager_egl.h',
       ],
     }],
   ],
 }