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

chrome/browser/sync/glue/device_info.cc

Index: chrome/browser/sync/glue/device_info.cc
diff --git a/chrome/browser/sync/glue/device_info.cc b/chrome/browser/sync/glue/device_info.cc
index 04836c49ac24ad785011485b5b890b7157f54ab2..76033de2758e4eef9a5cd364e10fca0ec7f0c03a 100644
--- a/chrome/browser/sync/glue/device_info.cc
+++ b/chrome/browser/sync/glue/device_info.cc
@@ -11,6 +11,7 @@
 #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 {
 
@@ -18,7 +19,7 @@ namespace {
 
 #if defined(OS_ANDROID)
 bool IsTabletUI() {
-  return CommandLine::ForCurrentProcess()->HasSwitch(switches::kTabletUI);
+  return ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET;
 }
 #endif