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

ui/base/ui_base_switches.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 "ui/base/ui_base_switches.h"
 
 namespace switches {
 
 // Disables use of DWM composition for top level windows.
 const char kDisableDwmComposition[] = "disable-dwm-composition";
@@ skipping 49 matching lines @@
 //   auto: Enabled on monitors which have touchscreen support (default).
 const char kTouchOptimizedUIAuto[] = "auto";
 //   enabled: always optimized for touch (even if no touch support).
 const char kTouchOptimizedUIEnabled[] = "enabled";
 //   disabled: never optimized for touch.
 const char kTouchOptimizedUIDisabled[] = "disabled";
 
 // Enables touch events on the side bezels.
 const char kTouchSideBezels[] = "touch-side-bezels";
 
+#if defined(OS_ANDROID)
+// Uses the tablet specific UI components when available

[Alexei Svitkine (slow), 2013/11/04 19:44:32]

Nit: add a .

[yao, 2013/11/04 20:23:27]

Done.

+const char kTabletUI[] = "tablet-ui";
+#endif
+
 #if defined(USE_XI2_MT)
 // The calibration factors given as "<left>,<right>,<top>,<bottom>".
 const char kTouchCalibration[] = "touch-calibration";
 #endif
 
 }  // namespace switches