Adds HotwordPrivate API for integrating the hotword feature to AppLauncher

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 def0df03fd54a0dc65aa9d37c58ba4de162ebea2..61478db531a3f2e54b16f6d07184b2fa6c1f3252 100644
--- a/chrome/browser/search/hotword_service.h
+++ b/chrome/browser/search/hotword_service.h
@@ -12,6 +12,7 @@
 #include "content/public/browser/notification_registrar.h"
 
 class ExtensionService;
+class HotwordClient;
 class Profile;
 
 namespace hotword_internal {
@@ -72,6 +73,11 @@ class HotwordService : public content::NotificationObserver,
   // turns it off via the settings menu.
   void OnHotwordSearchEnabledChanged(const std::string& pref_name);
 
+  // Called to handle the hotword session from |client|.
+  void RequestHotwordSession(HotwordClient* client);
+  void StopHotwordSession(HotwordClient* client);
+  HotwordClient* client() { return client_; }
+
  private:
   Profile* profile_;
 
@@ -79,6 +85,8 @@ class HotwordService : public content::NotificationObserver,
 
   content::NotificationRegistrar registrar_;
 
+  HotwordClient* client_;
+
   DISALLOW_COPY_AND_ASSIGN(HotwordService);
 };