Add launcherPage.hide() API.

chrome/browser/ui/app_list/app_list_service.h

 // Copyright 2013 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 CHROME_BROWSER_UI_APP_LIST_APP_LIST_SERVICE_H_
 #define CHROME_BROWSER_UI_APP_LIST_APP_LIST_SERVICE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 82 matching lines @@
   // they begin or complete installing. If |start_discovery_tracking| is set,
   // the app launcher will not actually be shown, but will start tracking UMA
   // for app launcher discovery.
   virtual void ShowForAppInstall(Profile* profile,
                                  const std::string& extension_id,
                                  bool start_discovery_tracking) = 0;
 
   // Shows the app list, and switches to the custom launcher page.
   virtual void ShowForCustomLauncherPage(Profile* profile) = 0;
 
+  // Hides the custom launcher page if it is currently being shown. Does nothing
+  // otherwise.
+  virtual void HideLauncherPageIfShowing() = 0;

[Matt Giuca, 2015/05/14 06:56:02]

I think the "IfShowing" is not necessary (it's sort of an obvious consequence
that if the launcher page is hidden, hide can't do anything). Worth documenting,
but unnecessary in the name.

[calamity, 2015/05/14 08:11:27]

Done. Also changed to Hide_Custom_LauncherPage() for consistency.

+
   // Dismiss the app list.
   virtual void DismissAppList() = 0;
 
   // Get the profile the app list is currently showing.
   virtual Profile* GetCurrentAppListProfile() = 0;
 
   // Returns true if the app list is visible.
   virtual bool IsAppListVisible() const = 0;
 
   // Enable the app list. What this does specifically will depend on the host
@@ skipping 15 matching lines @@
   virtual ~AppListService() {}
 
   // Do any once off initialization needed for the app list.
   virtual void Init(Profile* initial_profile) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AppListService);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_SERVICE_H_