Enable VAAPI accelerated decode on Linux

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',
     '../cc/cc.gyp:cc',
     '../components/tracing.gyp:tracing',
     '../device/bluetooth/bluetooth.gyp:device_bluetooth',
@@ skipping 774 matching lines @@
             '-e', '<(extra_header)',
             '-s', '<(stubs_filename_root)',
             '-p', '<(project_path)',
             '<@(_inputs)',
           ],
           'process_outputs_as_sources': 1,
           'message': 'Generating libv4l2 stubs for dynamic loading',
         },
       ],
     }],
-    ['chromeos==1', {
+    ['chromeos==1 or OS=="linux"', {
       'sources': [
         'common/gpu/media/accelerated_video_decoder.h',
         'common/gpu/media/h264_decoder.cc',
         'common/gpu/media/h264_decoder.h',
         'common/gpu/media/h264_dpb.cc',
         'common/gpu/media/h264_dpb.h',
         'common/gpu/media/vp8_decoder.cc',
         'common/gpu/media/vp8_decoder.h',
         'common/gpu/media/vp8_picture.cc',
         'common/gpu/media/vp8_picture.h',
@@ skipping 35 matching lines @@
       'include_dirs': [
         '<(DEPTH)/third_party/khronos',
       ],
     }],
     ['target_arch == "arm" and chromeos == 1', {
       'sources': [
         'common/gpu/media/tegra_v4l2_device.cc',
         'common/gpu/media/tegra_v4l2_device.h',
       ],
     }],
-    ['target_arch != "arm" and chromeos == 1', {
+    ['target_arch != "arm" and (chromeos == 1 or OS == "linux")', {
       'dependencies': [
         '../media/media.gyp:media',
         '../third_party/libyuv/libyuv.gyp:libyuv',
       ],
       'sources': [
         'common/gpu/media/va_surface.h',
         'common/gpu/media/vaapi_jpeg_decode_accelerator.cc',
         'common/gpu/media/vaapi_jpeg_decode_accelerator.h',
         'common/gpu/media/vaapi_jpeg_decoder.cc',
         'common/gpu/media/vaapi_jpeg_decoder.h',
@@ skipping 139 matching lines @@
       'sources!': [
         'common/cursors/webcursor_ozone.cc',
         'common/font_list_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.h',
       ],
     }],
   ],
 }