Add a --enable-gesture-typing flag. Currently this flag does nothing.

chrome/test/data/chromeos/virtual_keyboard/virtual_keyboard_test_base.js

 /*
  * Copyright 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * Set to true while debugging virtual keyboard tests, for verbose debug output.
  */
 var debugging = false;
@@ skipping 169 matching lines @@
     // hideKeyboard has one optional argument for error logging that does not
     // matter for the purpose of validating the call.
   };
 
   // Set data to be provided to callbacks in response to API calls.
   // TODO(kevers): Provide mechanism to override these values for individual
   // tests as needed.
   chrome.virtualKeyboardPrivate.getKeyboardConfig.setCallbackData({
     layout: 'qwerty',
     a11ymode: false,
-    experimental: false
+    experimental: false,
+    gesturetyping: false,
   });
 
   chrome.inputMethodPrivate.getCurrentInputMethod.setCallbackData('us:en');
 
   // Set an empty list. Tests that care about input methods in the menu will
   // need to call this again with their own list of input methods.
   chrome.inputMethodPrivate.getInputMethods.setCallbackData([]);
 
   chrome.runtime.getBackgroundPage.setCallbackData(undefined);
 
@@ skipping 225 matching lines @@
     assertTrue(!!switchKey, 'Unable to find symbol transition key');
     // Switch to symbol keyset.
     mockTap(switchKey);
   } else {
     var switchKey = findKey('~[<', 'row3');
     assertTrue(!!switchKey, 'Unable to find more transition key');
     // Switch to more keyset.
     mockTap(switchKey);
   }
 }