Adds DevTools commands for forced viewport override.

third_party/WebKit/Source/web/WebLocalFrameImpl.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 1706 matching lines @@
     client()->didFinishLoad(this);
 }
 
 void WebLocalFrameImpl::setCanHaveScrollbars(bool canHaveScrollbars)
 {
     frame()->view()->setCanHaveScrollbars(canHaveScrollbars);
 }
 
 void WebLocalFrameImpl::setInputEventsTransformForEmulation(const IntSize& offset, float contentScaleFactor)
 {
+    if (m_inputEventsOffsetForEmulation == offset && m_inputEventsScaleFactorForEmulation == contentScaleFactor)
+        return;
     m_inputEventsOffsetForEmulation = offset;
     m_inputEventsScaleFactorForEmulation = contentScaleFactor;
     if (frame()->view())
         frame()->view()->setInputEventsTransformForEmulation(m_inputEventsOffsetForEmulation, m_inputEventsScaleFactorForEmulation);
 }
 
 void WebLocalFrameImpl::loadJavaScriptURL(const KURL& url)
 {
     // This is copied from ScriptController::executeScriptIfJavaScriptURL.
     // Unfortunately, we cannot just use that method since it is private, and
@@ skipping 478 matching lines @@
         feature = UseCounter::ChromeLoadTimesNpnNegotiatedProtocol;
     } else if (metric == "wasAlternateProtocolAvailable") {
         feature = UseCounter::ChromeLoadTimesWasAlternateProtocolAvailable;
     } else if (metric == "connectionInfo") {
         feature = UseCounter::ChromeLoadTimesConnectionInfo;
     }
     UseCounter::count(frame(), feature);
 }
 
 } // namespace blink