Drag image should always use the real device scale factor

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 <memory>
 
@@ skipping 2226 matching lines @@
 
   preferred_size_ = size;
   Send(new ViewHostMsg_DidContentsPreferredSizeChange(GetRoutingID(),
                                                       preferred_size_));
 }
 
 blink::WebString RenderViewImpl::acceptLanguages() {
   return WebString::fromUTF8(renderer_preferences_.accept_languages);
 }
 
+float RenderViewImpl::nonEmulatedDeviceScaleFactor() {
+  return GetOriginalDeviceScaleFactor();
+}
+
 // RenderView implementation ---------------------------------------------------
 
 bool RenderViewImpl::Send(IPC::Message* message) {
   return RenderWidget::Send(message);
 }
 
 RenderWidget* RenderViewImpl::GetWidget() const {
   return const_cast<RenderWidget*>(static_cast<const RenderWidget*>(this));
 }
 
@@ skipping 1133 matching lines @@
         return render_frame->focused_pepper_plugin();
     }
     frame = frame->traverseNext(false);
   }
 
   return nullptr;
 }
 #endif
 
 }  // namespace content