Add vaapi_h264_decoder_test.

content/content_tests.gypi

 # Copyright (c) 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'test_support_content',
       'type': 'static_library',
       'dependencies': [
@@ skipping 1301 matching lines @@
                 'dependencies': [
                   '../build/linux/system.gyp:x11',  # Used by rendering_helper.cc
                 ],
               }],
             ],
             # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
             'msvs_disabled_warnings': [ 4267, ],
           },
         ]
     }],
+    ['chromeos==1 and use_x11 == 1 and target_arch != "arm"', {
+      'targets': [
+          {
+            'target_name': 'vaapi_h264_decoder_unittest',
+            'type': '<(gtest_target_type)',
+            'dependencies': [
+              'content.gyp:content_common',
+              '../base/base.gyp:base',
+              '../media/media.gyp:media',
+              '../testing/gtest.gyp:gtest',
+              '../third_party/libyuv/libyuv.gyp:libyuv',
+              '../ui/gfx/gfx.gyp:gfx_geometry',
+            ],
+            'sources': [
+              'common/gpu/media/vaapi_h264_decoder_unittest.cc',
+            ],
+            'include_dirs': [
+              '<(DEPTH)/third_party/libva',
+            ],
+            'link_settings': {
+              'libraries': [
+                '-lX11',
+              ],
+            },
+          },
+        ]
+    }],
     ['chromeos==1 and target_arch == "arm"', {
       'targets': [
         {
           'target_name': 'video_encode_accelerator_unittest',
           'type': 'executable',
           'dependencies': [
             'content.gyp:content',
             '../base/base.gyp:base',
             '../testing/gtest.gyp:gtest',
             '../media/media.gyp:media',
@@ skipping 316 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }