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

ui/base/ui_base_switches.cc

Index: ui/base/ui_base_switches.cc
diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index a955933e9045aa3afe78d08f0534b375c81d4187..6e3049209be222dae99e9b0dffa238e13e31334c 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -50,6 +50,7 @@ const char kLocalePak[] = "locale_pak";
 // do not have a user interface.
 const char kNoMessageBox[] = "no-message-box";
 
+

[Alexei Svitkine (slow), 2013/11/04 16:08:51]

Nit: Remove extra line you added here.

[yao, 2013/11/04 19:38:29]

Done.

 // Enables UI changes that make it easier to use with a touchscreen.
 // WARNING: Do not check this flag directly when deciding what UI to draw,
 // instead you must call ui::GetDisplayLayout
@@ -67,6 +68,11 @@ 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
+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";