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 a9fa984de37ac08bfbe5397587c924a8ab1b0b59..c14dbb5e7427cafc1f94a3832f9d16b5bd919b0e 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1045,6 +1045,10 @@ 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";