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

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 2233 matching lines @@
 }
 
 int RenderViewImpl::GetRoutingID() const {
   return routing_id_;
 }
 
 gfx::Size RenderViewImpl::GetSize() const {
   return size();
 }
 
+float RenderViewImpl::GetDeviceScaleFactor() const {
+  return device_scale_factor_;
+}
+
 WebPreferences& RenderViewImpl::GetWebkitPreferences() {
   return webkit_preferences_;
 }
 
 void RenderViewImpl::SetWebkitPreferences(const WebPreferences& preferences) {
   OnUpdateWebPreferences(preferences);
 }
 
 blink::WebView* RenderViewImpl::GetWebView() {
   return webview();
@@ skipping 1460 matching lines @@
   if (IsUseZoomForDSFEnabled()) {
     webview()->setZoomFactorForDeviceScaleFactor(device_scale_factor_);
   } else {
     webview()->setDeviceScaleFactor(device_scale_factor_);
   }
   webview()->settings()->setPreferCompositingToLCDTextEnabled(
       PreferCompositingToLCDText(compositor_deps_, device_scale_factor_));
 }
 
 }  // namespace content