chromeos: Add operations to monitor the screen orientation.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 9ca489e3dc905ac42f684648b1fa9b2953d41783..7980be4924a8001616859670a959ca4286adb519 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1049,6 +1049,10 @@ const char kEnableGView[]                   = "enable-gview";
 // Should we show the image based login?
 const char kEnableLoginImages[]             = "enable-login-images";
 
+// Rotate the screen in response to orientation changed events from dbus.
+// Will be reused for more generic sensors.
+const char kEnableSensors[]                 = "enable-sensors";
+
 // Enables static ip configuration.
 // This flag should be removed when it's on by default.
 const char kEnableStaticIPConfig[]          = "enable-static-ip-config";