Implement native speech recognition for the launcher.

chrome/browser/ui/app_list/start_page_service.h

Index: chrome/browser/ui/app_list/start_page_service.h
diff --git a/chrome/browser/ui/app_list/start_page_service.h b/chrome/browser/ui/app_list/start_page_service.h
index e2a7c824d9227d7159c96b1178eb35a32544c4b5..ba3ce96a0014dd5635a482138a79a1bbcc192e9f 100644
--- a/chrome/browser/ui/app_list/start_page_service.h
+++ b/chrome/browser/ui/app_list/start_page_service.h
@@ -25,6 +25,7 @@ class Profile;
 
 namespace app_list {
 
+class AppListSpeechRecognizer;
 class RecommendedApps;
 class StartPageObserver;
 
@@ -53,14 +54,20 @@ class StartPageService : public KeyedService {
   // They return essentially the same web contents but might return NULL when
   // some flag disables the feature.
   content::WebContents* GetStartPageContents();
-  content::WebContents* GetSpeechRecognitionContents();
+  virtual 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);
+  virtual void OnSpeechResult(const base::string16& query, bool is_final);
+  virtual void OnSpeechSoundLevelChanged(int16 level);
+  virtual void OnSpeechRecognitionStateChanged(
+      SpeechRecognitionState new_state);
+
+ protected:
+  // Protected for testing.
+  explicit StartPageService(Profile* profile);
+  ~StartPageService() override;
 
  private:
   friend class StartPageServiceFactory;
@@ -74,9 +81,6 @@ class StartPageService : public KeyedService {
   // getUserMedia() request from the web contents.
   class StartPageWebContentsDelegate;
 
-  explicit StartPageService(Profile* profile);
-  ~StartPageService() override;
-
   void LoadContents();
   void UnloadContents();
 
@@ -96,6 +100,8 @@ class StartPageService : public KeyedService {
   bool webui_finished_loading_;
   std::vector<base::Closure> pending_webui_callbacks_;
 
+  scoped_refptr<AppListSpeechRecognizer> speech_recognizer_;
+
   DISALLOW_COPY_AND_ASSIGN(StartPageService);
 };