Added flag to enable new menu style.
Changed so far: menu background, no gutter, separator, border with round corners (corners are not transparent yet).
This is work in progress, just want to keep change size manageable.

BUG=157692

Review URL: https://chromiumcodereview.appspot.com/11348055

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168671 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index be4639b8..98ee7358 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -56,6 +56,9 @@
 //   disabled: never optimized for touch.
 const char kTouchOptimizedUIDisabled[] = "disabled";
 
+// Enables new menu UI.
+const char kEnableNewMenuStyle[] = "enable-new-menu-style";
+
 #if defined(USE_XI2_MT)
 // The calibration factors given as "<left>,<right>,<top>,<bottom>".
 const char kTouchCalibration[] = "touch-calibration";