Allow component IME extension use app.window and add 'ime' window type for app window

extensions/browser/app_window/app_window.cc

 // Copyright 2014 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.
 
 #include "extensions/browser/app_window/app_window.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 132 matching lines @@
 
 // AppWindow::CreateParams
 
 AppWindow::CreateParams::CreateParams()
     : window_type(AppWindow::WINDOW_TYPE_DEFAULT),
       frame(AppWindow::FRAME_CHROME),
       has_frame_color(false),
       active_frame_color(SK_ColorBLACK),
       inactive_frame_color(SK_ColorBLACK),
       alpha_enabled(false),
+      is_ime_window(false),
       creator_process_id(0),
       state(ui::SHOW_STATE_DEFAULT),
       hidden(false),
       resizable(true),
       focused(true),
       always_on_top(false),
       visible_on_all_workspaces(false) {
 }
 
 AppWindow::CreateParams::~CreateParams() {}
@@ skipping 903 matching lines @@
         region.bounds.x(),
         region.bounds.y(),
         region.bounds.right(),
         region.bounds.bottom(),
         region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
   }
   return sk_region;
 }
 
 }  // namespace extensions