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 32 matching lines @@
 const char kLang[] = "lang";
 
 // Load the locale resources from the given path. When running on Mac/Unix the
 // path should point to a locale.pak file.
 const char kLocalePak[] = "locale_pak";
 
 // Disable ui::MessageBox. This is useful when running as part of scripts that
 // 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
 const char kTouchOptimizedUI[] = "touch-optimized-ui";
 
 // The values the kTouchOptimizedUI switch may have, as in
 // "--touch-optimized-ui=disabled".
 //   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
+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