[DocWriteBlocking] Add feature to block doc.written scripts if 2g-like network

third_party/WebKit/Source/web/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 52 matching lines @@
 void WebRuntimeFeatures::enableAccelerated2dCanvas(bool enable)
 {
     RuntimeEnabledFeatures::setAccelerated2dCanvasEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableAudioOutputDevices(bool enable)
 {
     RuntimeEnabledFeatures::setAudioOutputDevicesEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableBlockDocWriteIfEffectively2G(bool enable)
+{
+    RuntimeEnabledFeatures::setBlockDocWriteIfEffectively2GEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableCanvas2dImageChromium(bool enable)
 {
     RuntimeEnabledFeatures::setCanvas2dImageChromiumEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableColorCorrectRendering(bool enable)
 {
     RuntimeEnabledFeatures::setColorCorrectRenderingEnabled(enable);
 }
 
@@ skipping 291 matching lines @@
 {
     RuntimeEnabledFeatures::setTimerThrottlingForBackgroundTabsEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableSendBeaconThrowForBlobWithNonSimpleType(bool enable)
 {
     RuntimeEnabledFeatures::setSendBeaconThrowForBlobWithNonSimpleTypeEnabled(enable);
 }
 
 } // namespace blink