Do not register IME app window in launcher

extensions/browser/app_window/app_window.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_
 #define EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 333 matching lines @@
   // the renderer.
   void GetSerializedState(base::DictionaryValue* properties) const;
 
   // Called by the window API when events can be sent to the window for this
   // app.
   void WindowEventsReady();
 
   // Whether the app window wants to be alpha enabled.
   bool requested_alpha_enabled() const { return requested_alpha_enabled_; }
 
+  // Whether the app window is created by IME extensions.

[Mr4D (OOO till 08-26), 2015/03/02 16:44:12]

Hmm. Since there is only a single use case for this yet - maybe we should name
this "hide_app_window_in_launcher()" (and also name the var accordingly)?

If you have the feeling that the "ime" information is more valuable however you
can leave that.

[bshe, 2015/03/02 17:40:36]

Right. It is only used for one case now. But I am in the process of developing
new keyboard and we might need it to do more customization for IME windows, i.e.
always on top, movable. So I am in favor of keeping the ime name for now. If
later I found no other use case, I will change it to
hide_app_window_in_launcher. Added a todo.

+  bool is_ime_window() const { return is_ime_window_; }
+
   void SetAppWindowContentsForTesting(scoped_ptr<AppWindowContents> contents) {
     app_window_contents_ = contents.Pass();
   }
 
  protected:
   ~AppWindow() override;
 
  private:
   // PlatformAppBrowserTest needs access to web_contents()
   friend class PlatformAppBrowserTest;
@@ skipping 184 matching lines @@
   // Cache the desired value of the always-on-top property. When windows enter
   // fullscreen or overlap the Windows taskbar, this property will be
   // automatically and silently switched off for security reasons. It is
   // reinstated when the window exits fullscreen and moves away from the
   // taskbar.
   bool cached_always_on_top_;
 
   // Whether |alpha_enabled| was set in the CreateParams.
   bool requested_alpha_enabled_;
 
+  // Whether |is_ime_window| was set in the CreateParams.
+  bool is_ime_window_;
+
   base::WeakPtrFactory<AppWindow> image_loader_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindow);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_