Add iOS to the variations study proto.

chrome/browser/metrics/variations_service.cc

 // 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.
 
 #include "chrome/browser/metrics/variations_service.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/build_time.h"
@@ skipping 49 matching lines @@
 
 Study_Platform GetCurrentPlatform() {
 #if defined(OS_WIN)
   return Study_Platform_PLATFORM_WINDOWS;
 #elif defined(OS_MACOSX)
   return Study_Platform_PLATFORM_MAC;
 #elif defined(OS_CHROMEOS)
   return Study_Platform_PLATFORM_CHROMEOS;
 #elif defined(OS_ANDROID)
   return Study_Platform_PLATFORM_ANDROID;
+#elif defined(OS_IOS)
+  return Study_Platform_PLATFORM_IOS;
 #elif defined(OS_LINUX) || defined(OS_BSD) || defined(OS_SOLARIS)
   // Default BSD and SOLARIS to Linux to not break those builds, although these
   // platforms are not officially supported by Chrome.
   return Study_Platform_PLATFORM_LINUX;
 #else
 #error Unknown platform
 #endif
 }
 
 // Converts |date_time| in Study date format to base::Time.
@@ skipping 343 matching lines @@
                                                           variation_id);
     }
   }
 
   trial->SetForced();
   if (IsStudyExpired(study, reference_date))
     trial->Disable();
 }
 
 }  // namespace chrome_variations