Drag image should always use the real device scale factor

third_party/WebKit/Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
@@ skipping 563 matching lines @@
 
 float ChromeClientImpl::windowToViewportScalar(const float scalarValue) const
 {
     if (!m_webView->client())
         return scalarValue;
     WebFloatRect viewportRect(0, 0, scalarValue, 0);
     m_webView->client()->convertWindowToViewport(&viewportRect);
     return viewportRect.width;
 }
 
+float ChromeClientImpl::nonEmulatedDeviceScaleFactor() const
+{
+    return m_webView->client() ? m_webView->client()->nonEmulatedDeviceScaleFactor() : 1.f;
+}
+
 WebScreenInfo ChromeClientImpl::screenInfo() const
 {
     return m_webView->client() ? m_webView->client()->screenInfo() : WebScreenInfo();
 }
 
 void ChromeClientImpl::contentsSizeChanged(LocalFrame* frame, const IntSize& size) const
 {
     m_webView->didChangeContentsSize();
 
     WebLocalFrameImpl* webframe = WebLocalFrameImpl::fromFrame(frame);
@@ skipping 514 matching lines @@
 {
     return adoptPtr(m_webView->scheduler()->createFrameScheduler(blameContext).release());
 }
 
 double ChromeClientImpl::lastFrameTimeMonotonic() const
 {
     return m_webView->lastFrameTimeMonotonic();
 }
 
 } // namespace blink