Add cross-platform API to get the form factor of the device

chrome/browser/sync/glue/device_info.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/sync/glue/device_info.h"
 
 #include "base/command_line.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/values.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_thread.h"
 #include "sync/util/get_session_name.h"
+#include "ui/base/device_form_factor.h"
 
 namespace browser_sync {
 
 namespace {
 
 #if defined(OS_ANDROID)
 bool IsTabletUI() {
-  return CommandLine::ForCurrentProcess()->HasSwitch(switches::kTabletUI);
+  return ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET;
 }
 #endif
 
 // Converts VersionInfo::Channel to string for user-agent string.
 std::string ChannelToString(chrome::VersionInfo::Channel channel) {
   switch (channel) {
     case chrome::VersionInfo::CHANNEL_UNKNOWN:
       return "unknown";
     case chrome::VersionInfo::CHANNEL_CANARY:
       return "canary";
@@ skipping 202 matching lines @@
       guid,
       session_name,
       version_info.CreateVersionString(),
       MakeUserAgentForSyncApi(version_info),
       GetLocalDeviceType());
 
   callback.Run(local_info);
 }
 
 }  // namespace browser_sync