Support device scale factor test with popups in LayoutTest

components/html_viewer/web_test_delegate_impl.cc

Index: components/html_viewer/web_test_delegate_impl.cc
diff --git a/components/html_viewer/web_test_delegate_impl.cc b/components/html_viewer/web_test_delegate_impl.cc
index 9aba1a6ffa8222514da445193e4ea9086f66acdf..1645fd016646acc4f6d4059e48976907f0f02471 100644
--- a/components/html_viewer/web_test_delegate_impl.cc
+++ b/components/html_viewer/web_test_delegate_impl.cc
@@ -358,4 +358,10 @@ void WebTestDelegateImpl::OnWebTestProxyBaseDestroy(
     test_runner::WebTestProxyBase* base) {
 }
 
+blink::WebPoint WebTestDelegateImpl::ConvertDIPToNative(
+    const blink::WebPoint& point_in_dip) const {
+  NOTIMPLEMENTED();
+  return point_in_dip;
+}
+
 }  // namespace html_viewer