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 c73847eb114ee24fece72e6deaa18d12e0b895de..c5ba5dadefe28e72854dc4989408e95a12152c16 100644
--- a/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
+++ b/third_party/WebKit/Source/web/WebRuntimeFeatures.cpp
@@ -175,6 +175,11 @@ void WebRuntimeFeatures::enableMediaSource(bool enable)
     RuntimeEnabledFeatures::setMediaSourceEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableNotificationActionIcons(bool enable)
+{
+    RuntimeEnabledFeatures::setNotificationActionIconsEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableNotificationConstructor(bool enable)
 {
     RuntimeEnabledFeatures::setNotificationConstructorEnabled(enable);