Open the launcher when hotword is triggered in always-on mode.

chrome/browser/ui/app_list/app_list_service_disabled.cc

 // 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.
 
 #include "base/files/file_path.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
 
 namespace {
 
@@ skipping 15 matching lines @@
   virtual void Init(Profile* initial_profile) override {}
 
   virtual base::FilePath GetProfilePath(
       const base::FilePath& user_data_dir) override {
     return base::FilePath();
   }
   virtual void SetProfilePath(const base::FilePath& profile_path) override {}
 
   virtual void Show() override {}
   virtual void ShowForProfile(Profile* profile) override {}
+  virtual void ShowForVoiceSearch(Profile* profile) override {}
   virtual void ShowForAppInstall(Profile* profile,
                                  const std::string& extension_id,
                                  bool start_discovery_tracking) override {}
   virtual void DismissAppList() override {}
 
   virtual Profile* GetCurrentAppListProfile() override { return NULL; }
   virtual bool IsAppListVisible() const override { return false; }
   virtual void EnableAppList(Profile* initial_profile,
                              AppListEnableSource enable_source) override {}
   virtual gfx::NativeWindow GetAppListWindow() override { return NULL; }
@@ skipping 17 matching lines @@
 
 // static
 void AppListService::RegisterPrefs(PrefRegistrySimple* registry) {}
 
 // static
 bool AppListService::HandleLaunchCommandLine(
     const base::CommandLine& command_line,
     Profile* launch_profile) {
   return false;
 }