Add popup layout tests with device scale factor

components/test_runner/web_test_delegate.h

Index: components/test_runner/web_test_delegate.h
diff --git a/components/test_runner/web_test_delegate.h b/components/test_runner/web_test_delegate.h
index cb9df66cae892c025c3e87ff4e423bdbc9c39bc1..d5d67e4eb9c6dcc89e7f6889b743224314884410 100644
--- a/components/test_runner/web_test_delegate.h
+++ b/components/test_runner/web_test_delegate.h
@@ -30,6 +30,7 @@ class WebLocalFrame;
 class WebMediaStream;
 class WebPlugin;
 struct WebPluginParams;
+struct WebPoint;
 struct WebRect;
 struct WebSize;
 struct WebURLError;
@@ -283,6 +284,10 @@ class WebTestDelegate {
     const blink::WebPluginParams& params) = 0;
 
   virtual void OnWebTestProxyBaseDestroy(WebTestProxyBase* proxy) = 0;
+
+  // Convert the position in DIP to native coordinates.
+  virtual blink::WebPoint ConvertDIPToNative(
+      const blink::WebPoint& point_in_dip) const = 0;
 };
 
 }  // namespace test_runner