Implement native speech recognition for the launcher.

chrome/browser/ui/app_list/start_page_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_START_PAGE_SERVICE_H_
 #define CHROME_BROWSER_UI_APP_LIST_START_PAGE_SERVICE_H_
 
+#include <stdint.h>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
+#include "chrome/browser/ui/app_list/speech_recognizer_delegate.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 
 namespace extensions {
 class Extension;
 }
 
 class Profile;
 
 namespace app_list {
 
 class RecommendedApps;
+class SpeechRecognizer;
 class StartPageObserver;
 
 // StartPageService collects data to be displayed in app list's start page
 // and hosts the start page contents.
-class StartPageService : public KeyedService {
+class StartPageService : public KeyedService,
+                         public SpeechRecognizerDelegate {
  public:
   typedef std::vector<scoped_refptr<const extensions::Extension> >
       ExtensionList;
   // Gets the instance for the given profile.
   static StartPageService* Get(Profile* profile);
 
   void AddObserver(StartPageObserver* observer);
   void RemoveObserver(StartPageObserver* observer);
 
   void AppListShown();
   void AppListHidden();
   void ToggleSpeechRecognition();
 
   // Called when the WebUI has finished loading.
   void WebUILoaded();
 
   // Returns true if the hotword is enabled in the app-launcher.
   bool HotwordEnabled();
 
   // They return essentially the same web contents but might return NULL when
   // some flag disables the feature.
   content::WebContents* GetStartPageContents();
   content::WebContents* GetSpeechRecognitionContents();
 
   RecommendedApps* recommended_apps() { return recommended_apps_.get(); }
   Profile* profile() { return profile_; }
   SpeechRecognitionState state() { return state_; }
-  void OnSpeechResult(const base::string16& query, bool is_final);
-  void OnSpeechSoundLevelChanged(int16 level);
-  void OnSpeechRecognitionStateChanged(SpeechRecognitionState new_state);
+
+  // Overridden from app_list::SpeechRecognizerDelegate:
+  void OnSpeechResult(const base::string16& query, bool is_final) override;
+  void OnSpeechSoundLevelChanged(int16_t level) override;
+  void OnSpeechRecognitionStateChanged(
+      SpeechRecognitionState new_state) override;
+  content::WebContents* GetSpeechContents() override;
+
+ protected:
+  // Protected for testing.
+  explicit StartPageService(Profile* profile);
+  ~StartPageService() override;
 
  private:
   friend class StartPageServiceFactory;
 
   // ProfileDestroyObserver to shutdown the service on exiting. WebContents
   // depends on the profile and needs to be closed before the profile and its
   // keyed service shutdown.
   class ProfileDestroyObserver;
 
   // The WebContentsDelegate implementation for the start page. This allows
   // getUserMedia() request from the web contents.
   class StartPageWebContentsDelegate;
 
-  explicit StartPageService(Profile* profile);
-  ~StartPageService() override;
-
   void LoadContents();
   void UnloadContents();
 
   // KeyedService overrides:
   void Shutdown() override;
 
   Profile* profile_;
   scoped_ptr<content::WebContents> contents_;
   scoped_ptr<StartPageWebContentsDelegate> contents_delegate_;
   scoped_ptr<ProfileDestroyObserver> profile_destroy_observer_;
   scoped_ptr<RecommendedApps> recommended_apps_;
   SpeechRecognitionState state_;
   ObserverList<StartPageObserver> observers_;
   bool speech_button_toggled_manually_;
   bool speech_result_obtained_;
 
   bool webui_finished_loading_;
   std::vector<base::Closure> pending_webui_callbacks_;
 
+  scoped_ptr<SpeechRecognizer> speech_recognizer_;
+
   DISALLOW_COPY_AND_ASSIGN(StartPageService);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_START_PAGE_SERVICE_H_