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

ui/keyboard/keyboard_util.h

 // Copyright (c) 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.
 
 #ifndef UI_KEYBOARD_KEYBOARD_UTIL_H_
 #define UI_KEYBOARD_KEYBOARD_UTIL_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 78 matching lines @@
 // Sets policy override on whether to show the keyboard.
 KEYBOARD_EXPORT void SetKeyboardShowOverride(KeyboardShowOverride override);
 
 // Returns true if an IME extension can specify a custom input view for the
 // virtual keyboard window.
 KEYBOARD_EXPORT bool IsInputViewEnabled();
 
 // Returns true if experimental features are enabled for IME input-views.
 KEYBOARD_EXPORT bool IsExperimentalInputViewEnabled();
 
+// Returns true if gesture typing is enabled for virtual keyboard.
+KEYBOARD_EXPORT bool IsGestureTypingEnabled();
+
 // Insert |text| into the active TextInputClient if there is one. Returns true
 // if |text| was successfully inserted.
 KEYBOARD_EXPORT bool InsertText(const base::string16& text);
 
 // Move cursor when swipe on the virtualkeyboard. Returns true if cursor was
 // successfully moved according to |swipe_direction|.
 KEYBOARD_EXPORT bool MoveCursor(int swipe_direction,
                                 int modifier_flags,
                                 aura::WindowTreeHost* host);
 
@@ skipping 30 matching lines @@
 
 // Gets the override content url.
 KEYBOARD_EXPORT const GURL& GetOverrideContentUrl();
 
 // Logs the keyboard control event as a UMA stat.
 void LogKeyboardControlEvent(KeyboardControlEvent event);
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_UTIL_H_