Add Windows commandline switch --enable-views-textfield.

ui/base/ui_base_switches.cc

Index: ui/base/ui_base_switches.cc
diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index 7d40de89c2950c913e01353ac51f9be4a08432f4..0027763908c60156b45600d5b8145b98dd9a0620 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -20,6 +20,9 @@ const char kEnableTouchCalibration[] = "enable-touch-calibration";
 // Enable support for touch events.
 const char kEnableTouchEvents[] = "enable-touch-events";
 
+// Enables the Views textfield on Windows.
+const char kEnableViewsTextfield[] = "enable-views-textfield";
+
 // Generates a 2x version of resources for which no 2x version is available or
 // the 2x version is of an incorrect size and applies a red mask to the
 // resource. Resources for which hidpi is not supported because of software