Do not register IME app window in launcher

extensions/browser/app_window/app_window.h

Index: extensions/browser/app_window/app_window.h
diff --git a/extensions/browser/app_window/app_window.h b/extensions/browser/app_window/app_window.h
index 8d6ffea1c08b24193b260e1407a89693d3f0ac21..bf78e96ff1456e0cff586dd34aa5f6d8c0d66514 100644
--- a/extensions/browser/app_window/app_window.h
+++ b/extensions/browser/app_window/app_window.h
@@ -351,6 +351,12 @@ class AppWindow : public content::NotificationObserver,
   // 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.
+  // TODO(bshe): rename to hide_app_window_in_launcher if it is not used
+  // anywhere other than app_window_launcher_controller after M45. Otherwise,
+  // remove this TODO.
+  bool is_ime_window() const { return is_ime_window_; }
+
   void SetAppWindowContentsForTesting(scoped_ptr<AppWindowContents> contents) {
     app_window_contents_ = contents.Pass();
   }
@@ -555,6 +561,9 @@ class AppWindow : public content::NotificationObserver,
   // 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);