Add browser test for notification action icons.

third_party/WebKit/Source/web/WebRuntimeFeatures.cpp

Index: third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
diff --git a/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp b/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
index bdf44f33b6e8e8eed9afb0478564627552172183..bf90b02d59ab95273204dbe5497296f7bd6d8749 100644
--- a/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
+++ b/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
@@ -170,6 +170,11 @@ void WebRuntimeFeatures::enableMediaSource(bool enable)
     RuntimeEnabledFeatures::setMediaSourceEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableNotificationActionIcons(bool enable)
+{
+    RuntimeEnabledFeatures::setNotificationActionIconsEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableNotificationConstructor(bool enable)
 {
     RuntimeEnabledFeatures::setNotificationConstructorEnabled(enable);