Hotword Private API: Adds speech training functions.

chrome/browser/search/hotword_service.h

Index: chrome/browser/search/hotword_service.h
diff --git a/chrome/browser/search/hotword_service.h b/chrome/browser/search/hotword_service.h
index 79e22d968d350c8ef0c6bdfdf0234851db210174..7f99432db486939d892210dfd10adeb566c4a865 100644
--- a/chrome/browser/search/hotword_service.h
+++ b/chrome/browser/search/hotword_service.h
@@ -28,6 +28,8 @@ namespace hotword_internal {
 // Constants for the hotword field trial.
 extern const char kHotwordFieldTrialName[];
 extern const char kHotwordFieldTrialDisabledGroupName[];
+// String passed to indicate the training state has changed.
+extern const char kHotwordTrainingEnabled[];
 }  // namespace hotword_internal
 
 // Provides an interface for the Hotword component that does voice triggered
@@ -109,14 +111,24 @@ class HotwordService : public extensions::ExtensionRegistryObserver,
   // at which time we can simply launch the app in the given mode instead of
   // having to check for it here.
   enum LaunchMode {
-    AUDIO_HISTORY_ONLY,
     HOTWORD_ONLY,
     HOTWORD_AND_AUDIO_HISTORY,
-    SPEECH_TRAINING
+    RETRAIN
   };
   void LaunchHotwordAudioVerificationApp(const LaunchMode& launch_mode);
   virtual LaunchMode GetHotwordAudioVerificationLaunchMode();
 
+  // These methods control the speaker training communication between
+  // the Hotword Audio Verification App and the Hotword Extension that
+  // contains the NaCl module.
+  void StartTraining();
+  void FinalizeSpeakerModel();
+  void StopTraining();
+  void NotifyHotwordTriggered();
+
+  // Returns true if speaker training is currently in progress.
+  bool IsTraining();
+
  private:
   // Returns the ID of the extension that may need to be reinstalled.
   std::string ReinstalledExtensionId();
@@ -137,6 +149,8 @@ class HotwordService : public extensions::ExtensionRegistryObserver,
   HotwordClient* client_;
   int error_message_;
   bool reinstall_pending_;
+  // Whether we are currently in the process of training the speaker model.
+  bool training_;
 
   base::WeakPtrFactory<HotwordService> weak_factory_;