add gflags support files from webrtc

libyuv_test.gyp

 # Copyright 2011 The LibYuv Project Authors. All rights reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS. All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'variables': {
     'libyuv_disable_jpeg%': 0,
     'libyuv_enable_svn%': 0,
   },
   'targets': [
     {
       'target_name': 'libyuv_unittest',
       'type': '<(gtest_target_type)',
       'dependencies': [
         'libyuv.gyp:libyuv',
         'testing/gtest.gyp:gtest',
+        'third_party/gflags/gflags.gyp:gflags',
+      ],
+      'direct_dependent_settings': {
+        'defines': [
+          'GTEST_RELATIVE_PATH',
+        ],
+      },
+      'export_dependent_settings': [
+        '<(DEPTH)/testing/gtest.gyp:gtest',
       ],
       'defines': [
         # Enable the following 3 macros to turn off assembly for specified CPU.
         # 'LIBYUV_DISABLE_X86',
         # 'LIBYUV_DISABLE_NEON',
         # 'LIBYUV_DISABLE_MIPS',
         # Enable the following macro to build libyuv as a shared library (dll).
         # 'LIBYUV_USING_SHARED_LIBRARY',
       ],
       'sources': [
@@ skipping 171 matching lines @@
       ],
     }],
   ],
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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