Add a runtime flag in WebRuntimeFeatures to enable 'image/webp' accept header

Source/WebKit/chromium/src/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2009 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 556 matching lines @@
 void WebRuntimeFeatures::enableDoNotTrack(bool enable)
 {
     RuntimeEnabledFeatures::setDoNotTrackEnabled(enable);
 }
 
 bool WebRuntimeFeatures::isDoNotTrackEnabled()
 {
     return RuntimeEnabledFeatures::doNotTrackEnabled();
 }
 
+void WebRuntimeFeatures::enableWebPInAcceptHeader(bool enable)
+{
+#if USE(WEBP)
+    RuntimeEnabledFeatures::setWebPInAcceptHeaderEnabled(enable);
+#else
+    UNUSED_PARAM(enable);
+#endif
+}
+
+bool WebRuntimeFeatures::isWebPInAcceptHeaderEnabled()
+{
+#if USE(WEBP)
+    return RuntimeEnabledFeatures::webPInAcceptHeaderEnabled();
+#else
+    return false;
+#endif
+}
+
 } // namespace WebKit