Add Mac implementation of data_fetcher for gamepad.

chrome/browser/about_flags.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 413 matching lines @@
     IDS_FLAGS_AURA_WINDOWS_NAME,
     IDS_FLAGS_AURA_WINDOWS_DESCRIPTION,
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kAuraWindows)
   },
 #endif
   {
     "enable-gamepad",
     IDS_FLAGS_ENABLE_GAMEPAD_NAME,
     IDS_FLAGS_ENABLE_GAMEPAD_DESCRIPTION,
-    kOsWin,
+    kOsMac | kOsWin,
     SINGLE_VALUE_TYPE(switches::kEnableGamepad)
   },
 };
 
 const Experiment* experiments = kExperiments;
 size_t num_experiments = arraysize(kExperiments);
 
 // Stores and encapsulates the little state that about:flags has.
 class FlagsState {
  public:
@@ skipping 411 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags