libcef/browser/osr/browser_platform_delegate_osr.cc [345:378]:
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  const gfx::Point& screen_pt = GetScreenPoint(client_pt);

  gfx::PointF transformed_pt;
  content::RenderWidgetHostImpl* target_rwh =
      web_contents->GetInputEventRouter()->GetRenderWidgetHostAtPoint(
          web_contents->GetRenderViewHost()->GetWidget()->GetView(),
          gfx::PointF(client_pt), &transformed_pt);

  if (target_rwh != current_rwh_for_drag_.get()) {
    if (current_rwh_for_drag_) {
      gfx::PointF transformed_leave_point(client_pt);
      gfx::PointF transformed_screen_point(screen_pt);
      static_cast<content::RenderWidgetHostViewBase*>(
          web_contents->GetRenderWidgetHostView())
          ->TransformPointToCoordSpaceForView(
              gfx::PointF(client_pt),
              static_cast<content::RenderWidgetHostViewBase*>(
                  current_rwh_for_drag_->GetView()),
              &transformed_leave_point);
      static_cast<content::RenderWidgetHostViewBase*>(
          web_contents->GetRenderWidgetHostView())
          ->TransformPointToCoordSpaceForView(
              gfx::PointF(screen_pt),
              static_cast<content::RenderWidgetHostViewBase*>(
                  current_rwh_for_drag_->GetView()),
              &transformed_screen_point);
      current_rwh_for_drag_->DragTargetDragLeave(transformed_leave_point,
                                                 transformed_screen_point);
    }
    DragTargetDragEnter(drag_data_, event, drag_allowed_ops_);
  }

  if (!drag_data_)
    return;
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libcef/browser/osr/browser_platform_delegate_osr.cc [412:445]:
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  const gfx::Point& screen_pt = GetScreenPoint(client_pt);

  gfx::PointF transformed_pt;
  content::RenderWidgetHostImpl* target_rwh =
      web_contents->GetInputEventRouter()->GetRenderWidgetHostAtPoint(
          web_contents->GetRenderViewHost()->GetWidget()->GetView(),
          gfx::PointF(client_pt), &transformed_pt);

  if (target_rwh != current_rwh_for_drag_.get()) {
    if (current_rwh_for_drag_) {
      gfx::PointF transformed_leave_point(client_pt);
      gfx::PointF transformed_screen_point(screen_pt);
      static_cast<content::RenderWidgetHostViewBase*>(
          web_contents->GetRenderWidgetHostView())
          ->TransformPointToCoordSpaceForView(
              gfx::PointF(client_pt),
              static_cast<content::RenderWidgetHostViewBase*>(
                  current_rwh_for_drag_->GetView()),
              &transformed_leave_point);
      static_cast<content::RenderWidgetHostViewBase*>(
          web_contents->GetRenderWidgetHostView())
          ->TransformPointToCoordSpaceForView(
              gfx::PointF(screen_pt),
              static_cast<content::RenderWidgetHostViewBase*>(
                  current_rwh_for_drag_->GetView()),
              &transformed_screen_point);
      current_rwh_for_drag_->DragTargetDragLeave(transformed_leave_point,
                                                 transformed_screen_point);
    }
    DragTargetDragEnter(drag_data_, event, drag_allowed_ops_);
  }

  if (!drag_data_)
    return;
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