Make ui::TextInputClient::IsEditCommandEnabled const.

ui/base/ime/text_input_client.h

 // Copyright (c) 2012 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_BASE_IME_TEXT_INPUT_CLIENT_H_
 #define UI_BASE_IME_TEXT_INPUT_CLIENT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 149 matching lines @@
 
   // Ensure the caret is within |rect|.  |rect| is in screen coordinates and
   // may extend beyond the bounds of this TextInputClient.
   // Note: On Windows, the returned value is supposed to be DIP (Density
   // Independent Pixel).
   // TODO(ime): Have a clear spec whether the returned value is DIP or not.
   // http://crbug.com/360334
   virtual void EnsureCaretInRect(const gfx::Rect& rect) = 0;
 
   // Returns true if |command_id| is currently allowed to be executed.
-  virtual bool IsEditCommandEnabled(int command_id) = 0;
+  virtual bool IsEditCommandEnabled(int command_id) const = 0;
 
   // Execute the command specified by |command_id| on the next key event.
   // This allows a TextInputClient to be informed of a platform-independent edit
   // command that has been derived from the key event currently being dispatched
   // (but not yet sent to the TextInputClient). The edit command will take into
   // account any OS-specific, or user-specified, keybindings that may be set up.
   virtual void SetEditCommandForNextKeyEvent(int command_id) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_TEXT_INPUT_CLIENT_H_