Add autotestPrivate.getVisibleNotifications API

chrome/browser/extensions/api/autotest_private/autotest_private_api.h

Index: chrome/browser/extensions/api/autotest_private/autotest_private_api.h
diff --git a/chrome/browser/extensions/api/autotest_private/autotest_private_api.h b/chrome/browser/extensions/api/autotest_private/autotest_private_api.h
index 089a02333a4a8cf5c2467b6cc26855d9345eb524..092329ecf3fb62c24a3e9a47cd6179e3f6f9df28 100644
--- a/chrome/browser/extensions/api/autotest_private/autotest_private_api.h
+++ b/chrome/browser/extensions/api/autotest_private/autotest_private_api.h
@@ -10,6 +10,7 @@
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
+#include "ui/message_center/notification_types.h"
 
 namespace extensions {
 
@@ -160,6 +161,19 @@ class AutotestPrivateSetPrimaryButtonRightFunction
   bool RunSync() override;
 };
 
+class AutotestPrivateGetVisibleNotificationsFunction
+    : public ChromeSyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("autotestPrivate.getVisibleNotifications",
+                             AUTOTESTPRIVATE_GETVISIBLENOTIFICATIONS)
+
+ private:
+  static std::string ConvertToString(message_center::NotificationType type);
+
+  ~AutotestPrivateGetVisibleNotificationsFunction() override {}
+  bool RunSync() override;
+};
+
 // Don't kill the browser when we're in a browser test.
 void SetAutotestPrivateTest();