Set overflow: auto in StyleResolver::styleForDocument.

third_party/WebKit/Source/web/tests/sim/SimTest.cpp

Index: third_party/WebKit/Source/web/tests/sim/SimTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/sim/SimTest.cpp b/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
index a3e01fe09faf235281df41b91589a4483b7dec63..8350a076d85acc162cb93249c40ff29bf2eb5ced 100644
--- a/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
+++ b/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
@@ -61,6 +61,10 @@ WebViewImpl& SimTest::webView() {
   return *m_webViewHelper.webView();
 }
 
+WebLocalFrameImpl& SimTest::mainFrame() {
+  return *webView().mainFrameImpl();
+}
+
 const SimWebViewClient& SimTest::webViewClient() const {
   return m_webViewClient;
 }