Extract a delegate interface from c/b/input_method to permit decoupling from c/b.

chrome/chrome_browser_chromeos.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_chromeos',
       'type': 'static_library',
@@ skipping 308 matching lines @@
         'browser/chromeos/input_method/infolist_window_view.cc',
         'browser/chromeos/input_method/infolist_window_view.h',
         'browser/chromeos/input_method/input_method_engine_ibus.cc',
         'browser/chromeos/input_method/input_method_engine_ibus.h',
         'browser/chromeos/input_method/ibus_keymap.cc',
         'browser/chromeos/input_method/ibus_keymap.h',
         'browser/chromeos/input_method/ibus_ui_controller.cc',
         'browser/chromeos/input_method/ibus_ui_controller.h',
         'browser/chromeos/input_method/input_method_config.cc',
         'browser/chromeos/input_method/input_method_config.h',
+        'browser/chromeos/input_method/input_method_delegate.h',
+        'browser/chromeos/input_method/input_method_delegate_impl.cc',
+        'browser/chromeos/input_method/input_method_delegate_impl.h',
         'browser/chromeos/input_method/input_method_descriptor.cc',
         'browser/chromeos/input_method/input_method_descriptor.h',
         'browser/chromeos/input_method/input_method_engine.cc',
         'browser/chromeos/input_method/input_method_engine.h',
         'browser/chromeos/input_method/input_method_manager.cc',
         'browser/chromeos/input_method/input_method_manager.h',
         'browser/chromeos/input_method/input_method_manager_impl.cc',
         'browser/chromeos/input_method/input_method_manager_impl.h',
         'browser/chromeos/input_method/input_method_property.cc',
         'browser/chromeos/input_method/input_method_property.h',
@@ skipping 437 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/chromeos/drive/drive.proto' ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/drive',
         'proto_out_dir': 'chrome/browser/chromeos/drive',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }