Add a public API to enable/disable blink runtime features by name

Source/WebKit/chromium/src/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
 void WebRuntimeFeatures::enableExperimentalFeatures(bool enable)
 {
     RuntimeEnabledFeatures::setExperimentalFeaturesEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableTestOnlyFeatures(bool enable)
 {
     RuntimeEnabledFeatures::setTestFeaturesEnabled(enable);
 }
 
+bool WebRuntimeFeatures::setFeatureEnabled(const WebString& feature, bool enable)
+{
+    return RuntimeEnabledFeatures::setFeatureEnabled(feature, enable);
+}
+
 void WebRuntimeFeatures::enableApplicationCache(bool enable)
 {
     RuntimeEnabledFeatures::setApplicationCacheEnabled(enable);
 }
 
 bool WebRuntimeFeatures::isApplicationCacheEnabled()
 {
     return RuntimeEnabledFeatures::applicationCacheEnabled();
 }
 
@@ skipping 526 matching lines @@
 {
     RuntimeEnabledFeatures::setInputTypeColorEnabled(enable);
 }
 
 bool WebRuntimeFeatures::isInputTypeColorEnabled()
 {
     return RuntimeEnabledFeatures::inputTypeColorEnabled();
 }
 
 } // namespace WebKit