Fix SysStrings unit test failure on Chromecast

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 825 matching lines @@
         ['OS == "android" and _toolset == "target"', {
           'sources': [
             'memory/discardable_memory_ashmem_allocator_unittest.cc',
           ],
         }],
         ['OS == "android"', {
           'sources/': [
             ['include', '^debug/proc_maps_linux_unittest\\.cc$'],
           ],
         }],
+        # Enable more direct string conversions on platforms with native utf8
+        # strings
+        ['OS=="mac" or OS=="ios" or <(chromeos)==1 or <(chromecast)==1', {
+          'defines': ['SYSTEM_NATIVE_UTF8'],
+        }],
       ],  # target_conditions
     },
     {
       'target_name': 'base_perftests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         'base',
         'test_support_base',
         '../testing/gtest.gyp:gtest',
       ],
@@ skipping 743 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }