Add runtime setting to force passive event listeners.

third_party/WebKit/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 609 matching lines @@
 void WebSettingsImpl::setStrictPowerfulFeatureRestrictions(bool enabled)
 {
     m_settings->setStrictPowerfulFeatureRestrictions(enabled);
 }
 
 void WebSettingsImpl::setStrictlyBlockBlockableMixedContent(bool enabled)
 {
     m_settings->setStrictlyBlockBlockableMixedContent(enabled);
 }
 
+void WebSettingsImpl::setPassiveEventListenerDefault(PassiveEventListenerDefault defaultValue)
+{
+    m_settings->setPassiveListenerDefault(static_cast<PassiveListenerDefault>(defaultValue));
+}
+
 void WebSettingsImpl::setPasswordEchoEnabled(bool flag)
 {
     m_settings->setPasswordEchoEnabled(flag);
 }
 
 void WebSettingsImpl::setPasswordEchoDurationInSeconds(double durationInSeconds)
 {
     m_settings->setPasswordEchoDurationInSeconds(durationInSeconds);
 }
 
@@ skipping 162 matching lines @@
 {
     m_settings->setV8CacheStrategiesForCacheStorage(static_cast<blink::V8CacheStrategiesForCacheStorage>(strategies));
 }
 
 void WebSettingsImpl::setViewportStyle(WebViewportStyle style)
 {
     m_devToolsEmulator->setViewportStyle(style);
 }
 
 } // namespace blink