Add --enable-device-orientation switch and set ENABLE_DEVICE_ORIENTATION=1

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 ccef4750a03212805988877da0ded3ea04e18acc..93899c95a843eaa7caae8c668ad3b4785abe6f07 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -293,6 +293,9 @@ const char kEnableCloudPrintProxy[]         = "enable-cloud-print-proxy";
 // Enables the Cloud Print dialog hosting code.
 const char kEnableCloudPrint[]              = "enable-cloud-print";
 
+// Enables device orientation events.
+const char kEnableDeviceOrientation[]       = "enable-device-orientation";
+
 // Enables extension APIs that are in development.
 const char kEnableExperimentalExtensionApis[] =
     "enable-experimental-extension-apis";