Fix mouse wheel over-scrolls when display is scaled and scroll is paginated

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 1847 matching lines @@
 }
 
 void RenderViewImpl::convertViewportToWindow(blink::WebRect* rect) {
   RenderWidget::convertViewportToWindow(rect);
 }
 
 void RenderViewImpl::convertWindowToViewport(blink::WebFloatRect* rect) {
   RenderWidget::convertWindowToViewport(rect);
 }
 
+float RenderViewImpl::GetOriginalDeviceScaleFactor() const {
+  if (IsUseZoomForDSFEnabled())
+    return RenderWidget::GetOriginalDeviceScaleFactor();
+  return 1.0f;
+}
+
 void RenderViewImpl::didAutoResize(const blink::WebSize& newSize) {
   RenderWidget::DidAutoResize(newSize);
 }
 
 void RenderViewImpl::didOverscroll(
     const blink::WebFloatSize& overscrollDelta,
     const blink::WebFloatSize& accumulatedOverscroll,
     const blink::WebFloatPoint& positionInViewport,
     const blink::WebFloatSize& velocityInViewport) {
   RenderWidget::didOverscroll(overscrollDelta, accumulatedOverscroll,
@@ skipping 854 matching lines @@
                             INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   }
 
   std::unique_ptr<InputEventAck> ack(
       new InputEventAck(InputEventAckSource::MAIN_THREAD, input_event->type,
                         INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
   OnInputEventAck(std::move(ack));
 }
 
 }  // namespace content