Use the screen info's scale factor to scale the drag image

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 3193 matching lines @@
 {
     ASSERT(page());
 
     scaleFactor = clampPageScaleFactorToLimits(scaleFactor);
     if (scaleFactor == pageScaleFactor())
         return;
 
     page()->frameHost().visualViewport().setScale(scaleFactor);
 }
 
-float WebViewImpl::deviceScaleFactor() const
-{
-    if (!page())
-        return 1;
-
-    return page()->deviceScaleFactor();
-}
-
 void WebViewImpl::setDeviceScaleFactor(float scaleFactor)
 {
     if (!page())
         return;
 
     page()->setDeviceScaleFactor(scaleFactor);
 
     if (m_layerTreeView)
         updateLayerTreeDeviceScaleFactor();
 }
@@ skipping 1393 matching lines @@
 
 void WebViewImpl::detachPaintArtifactCompositor()
 {
     if (!m_layerTreeView)
         return;
 
     m_layerTreeView->setDeferCommits(true);
     m_layerTreeView->clearRootLayer();
 }
 
+float WebViewImpl::deviceScaleFactor() const
+{
+    // TODO(oshima): Investigate if this should return the ScreenInfo's scale factor rather than
+    // page's scale factor, which can be 1 in use-zoom-for-dsf mode.
+    if (!page())
+        return 1;
+
+    return page()->deviceScaleFactor();
+}
+
 } // namespace blink