Plumb whether or not a frame is in shadow DOM to the embedder.

Source/web/tests/WebViewTest.cpp

Index: Source/web/tests/WebViewTest.cpp
diff --git a/Source/web/tests/WebViewTest.cpp b/Source/web/tests/WebViewTest.cpp
index a88e49cd46ee9322e176bc635c291cf037a5e18e..e05799b502520e42bc822be5ba121f7125df4d57 100644
--- a/Source/web/tests/WebViewTest.cpp
+++ b/Source/web/tests/WebViewTest.cpp
@@ -80,6 +80,7 @@
 #include "public/web/WebInputEvent.h"
 #include "public/web/WebScriptSource.h"
 #include "public/web/WebSettings.h"
+#include "public/web/WebTreeScopeType.h"
 #include "public/web/WebViewClient.h"
 #include "public/web/WebWidget.h"
 #include "public/web/WebWidgetClient.h"
@@ -498,7 +499,7 @@ TEST_F(WebViewTest, SetBaseBackgroundColorBeforeMainFrame)
     // webView does not have a frame yet, but we should still be able to set the background color.
     webView->setBaseBackgroundColor(kBlue);
     EXPECT_EQ(kBlue, webView->backgroundColor());
-    WebLocalFrameImpl* frame = WebLocalFrameImpl::create(0);
+    WebLocalFrameImpl* frame = WebLocalFrameImpl::create(WebTreeScopeType::Document, nullptr);
     webView->setMainFrame(frame);
     webView->close();
     frame->close();