Expose showModalDialog runtime flag via WebRuntimeFeatures

BUG=none
R=ojan@chromium.org,atwilson@chromium.org

Review URL: https://codereview.chromium.org/329873002

git-svn-id: svn://svn.chromium.org/blink/trunk@176037 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/WebRuntimeFeatures.cpp

@@ -285,4 +285,9 @@ void WebRuntimeFeatures::enableLayerSquashing(bool enable)
     RuntimeEnabledFeatures::setLayerSquashingEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableShowModalDialog(bool enable)
+{
+    RuntimeEnabledFeatures::setShowModalDialogEnabled(enable);
+}
+
 } // namespace blink

third_party/WebKit/public/web/WebRuntimeFeatures.h

@@ -130,6 +130,8 @@ public:
 
     BLINK_EXPORT static void enableLayerSquashing(bool);
 
+    BLINK_EXPORT static void enableShowModalDialog(bool);
+
 private:
     WebRuntimeFeatures();
 };