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

Index: chrome/browser/extensions/api/hotword_private/hotword_private_api.h
diff --git a/chrome/browser/extensions/api/hotword_private/hotword_private_api.h b/chrome/browser/extensions/api/hotword_private/hotword_private_api.h
index a7135dd2ec52b8e936136e00d653753ad71ad1d0..1272ded395f31699bae81b0d80f98f3a2375141f 100644
--- a/chrome/browser/extensions/api/hotword_private/hotword_private_api.h
+++ b/chrome/browser/extensions/api/hotword_private/hotword_private_api.h
@@ -42,6 +42,8 @@ class HotwordPrivateEventService : public BrowserContextKeyedAPI {
 
   void OnDeleteSpeakerModel();
 
+  void OnSpeakerModelExists();
+
  private:
   friend class BrowserContextKeyedAPIFactory<HotwordPrivateEventService>;
 
@@ -236,6 +238,19 @@ class HotwordPrivateGetAudioHistoryEnabledFunction
   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_