Add testRunner.cancelAllActiveNotifications to close all active notifications.

Source/testing/runner/TestRunner.cpp

Index: Source/testing/runner/TestRunner.cpp
diff --git a/Source/testing/runner/TestRunner.cpp b/Source/testing/runner/TestRunner.cpp
index 550abc9573ce6521a49a78f3efe366b20a710aeb..01b9280632d95c9c1ca570b87b1cc2f99a9aa2bf 100644
--- a/Source/testing/runner/TestRunner.cpp
+++ b/Source/testing/runner/TestRunner.cpp
@@ -284,6 +284,7 @@ TestRunner::TestRunner(TestInterfaces* interfaces)
 #if ENABLE_NOTIFICATIONS
     bindMethod("grantWebNotificationPermission", &TestRunner::grantWebNotificationPermission);
     bindMethod("simulateLegacyWebNotificationClick", &TestRunner::simulateLegacyWebNotificationClick);
+    bindMethod("cancelAllActiveNotifications", &TestRunner::cancelAllActiveNotifications);
 #endif
     bindMethod("addMockSpeechInputResult", &TestRunner::addMockSpeechInputResult);
     bindMethod("setMockSpeechInputDumpRect", &TestRunner::setMockSpeechInputDumpRect);
@@ -1866,6 +1867,12 @@ void TestRunner::simulateLegacyWebNotificationClick(const CppArgumentList& argum
     }
     result->set(m_notificationPresenter->simulateClick(WebString::fromUTF8(arguments[0].toString())));
 }
+
+void TestRunner::cancelAllActiveNotifications(const CppArgumentList& arguments, CppVariant* result)
+{
+    m_notificationPresenter->cancelAllActiveNotifications();
+    result->set(true);
+}
 #endif
 
 void TestRunner::addMockSpeechInputResult(const CppArgumentList& arguments, CppVariant* result)