Hotword Private API: Add function and event to query the existence of a speaker model

chrome/browser/extensions/api/hotword_private/hotword_private_api.h

 // Copyright 2014 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_EXTENSIONS_API_HOTWORD_PRIVATE_HOTWORD_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_HOTWORD_PRIVATE_HOTWORD_PRIVATE_API_H_
 
 #include "base/prefs/pref_change_registrar.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
@@ skipping 24 matching lines @@
   void OnHotwordSessionStopped();
 
   void OnHotwordTriggered();
 
   void OnFinalizeSpeakerModel();
 
   void OnSpeakerModelSaved();
 
   void OnDeleteSpeakerModel();
 
+  void OnSpeakerModelExists();
+
  private:
   friend class BrowserContextKeyedAPIFactory<HotwordPrivateEventService>;
 
   void SignalEvent(const std::string& event_name);
 
   Profile* profile_;
   PrefChangeRegistrar pref_change_registrar_;
 };
 
 
@@ skipping 174 matching lines @@
 
  protected:
   ~HotwordPrivateGetAudioHistoryEnabledFunction() override {}
 
   // ExtensionFunction:
   bool RunAsync() override;
 
   void SetResultAndSendResponse(bool success, bool new_enabled_value);
 };
 
+class HotwordPrivateSpeakerModelExistsResultFunction :
+    public ChromeSyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("hotwordPrivate.speakerModelExistsResult",
+                             HOTWORDPRIVATE_SPEAKERMODELEXISTSRESULT)
+
+ protected:
+  ~HotwordPrivateSpeakerModelExistsResultFunction() override {}
+
+  // ExtensionFunction:
+  bool RunSync() override;
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_HOTWORD_PRIVATE_HOTWORD_PRIVATE_API_H_