enable V4L2 VDA in VDA unittest on x86 CrOS platform

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 787 matching lines @@
             '-s', '<(stubs_filename_root)',
             '-p', '<(project_path)',
             '<@(_inputs)',
           ],
           'process_outputs_as_sources': 1,
           'message': 'Generating libv4l2 stubs for dynamic loading',
         },
       ],
     }],
     ['chromeos==1 and use_v4l2_codec==1', {
+      'direct_dependent_settings': {
+        'defines': [
+          'USE_V4L2_CODEC'
+        ],
+      },
       'defines': [
-        'USE_V4L2_CODEC',
+        'USE_V4L2_CODEC'
       ],
     }],
     ['chromeos==1 and (target_arch=="arm" or (use_ozone==1 and use_v4l2_codec==1))', {
       'dependencies': [
         '../media/media.gyp:media',
       ],
       'sources': [
         'common/gpu/media/generic_v4l2_video_device.cc',
         'common/gpu/media/generic_v4l2_video_device.h',
         'common/gpu/media/v4l2_image_processor.cc',
@@ skipping 213 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',
       ],
     }],
   ],
 }