Add a setting to determine whether showing context menu on mouse up.

Source/web/WebSettingsImpl.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 453 matching lines @@
 void WebSettingsImpl::setRenderVSyncNotificationEnabled(bool enabled)
 {
     m_renderVSyncNotificationEnabled = enabled;
 }
 
 void WebSettingsImpl::setWebGLErrorsToConsoleEnabled(bool enabled)
 {
     m_settings->setWebGLErrorsToConsoleEnabled(enabled);
 }
 
+void WebSettingsImpl::setShowContextMenuOnMouseUp(bool enabled)
+{
+    m_settings->setShowContextMenuOnMouseUp(enabled);
+}
+
 void WebSettingsImpl::setShowFPSCounter(bool show)
 {
     m_showFPSCounter = show;
 }
 
 void WebSettingsImpl::setShowPaintRects(bool show)
 {
     m_showPaintRects = show;
 }
 
@@ skipping 267 matching lines @@
 {
     m_settings->setV8ScriptStreamingEnabled(enabled);
 }
 
 void WebSettingsImpl::setV8ScriptStreamingMode(V8ScriptStreamingMode mode)
 {
     m_settings->setV8ScriptStreamingMode(static_cast<blink::ScriptStreamingMode>(mode));
 }
 
 } // namespace blink