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

chrome/common/device_form_factor_android.cc

Index: chrome/common/device_form_factor_android.cc
diff --git a/chrome/common/device_form_factor_android.cc b/chrome/common/device_form_factor_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..260f6ac734fa823b5b42eeb5728c7296e508964f
--- /dev/null
+++ b/chrome/common/device_form_factor_android.cc
@@ -0,0 +1,15 @@
+// Copyright 2013 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 "device_form_factor.h"
+
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
+
+DeviceFormFactor GetDeviceFormFactor() {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kTabletUI)) {

[Alexei Svitkine (slow), 2013/10/29 20:25:05]

There are several places that use this logic directly. Can you update them to
use the new API you're adding?

[yao, 2013/10/29 22:44:13]

Done.

+    return Device_Form_Factor_TABLET;
+  }
+  return Device_Form_Factor_PHONE;
+}