(blink) Propagate scrolling/marginwidth/marginheight property values to child frame.

Source/web/WebLocalFrameImpl.cpp

Index: Source/web/WebLocalFrameImpl.cpp
diff --git a/Source/web/WebLocalFrameImpl.cpp b/Source/web/WebLocalFrameImpl.cpp
index 4b316952f8c3cfc64754fdbec9b4b7ef04991323..103824ef92747621b5cab518dd2e280a835e3503 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -200,6 +200,7 @@
 #include "public/web/WebFindOptions.h"
 #include "public/web/WebFormElement.h"
 #include "public/web/WebFrameClient.h"
+#include "public/web/WebFrameOwnerProperties.h"
 #include "public/web/WebHistoryItem.h"
 #include "public/web/WebIconURL.h"
 #include "public/web/WebInputElement.h"
@@ -1754,7 +1755,28 @@ PassRefPtrWillBeRawPtr<LocalFrame> WebLocalFrameImpl::createChildFrame(const Fra
     WebTreeScopeType scope = frame()->document() == ownerElement->treeScope()
         ? WebTreeScopeType::Document
         : WebTreeScopeType::Shadow;
-    WebLocalFrameImpl* webframeChild = toWebLocalFrameImpl(m_client->createChildFrame(this, scope, name, static_cast<WebSandboxFlags>(ownerElement->sandboxFlags())));
+    int marginWidth = -1;
+    int marginHeight = -1;
+    if (isHTMLFrameElementBase(ownerElement)) {
+        marginWidth = toHTMLFrameElementBase(ownerElement)->marginWidth();
+        marginHeight = toHTMLFrameElementBase(ownerElement)->marginHeight();
+    }
+
+    WebFrameOwnerProperties::ScrollingMode scrollingMode = WebFrameOwnerProperties::ScrollingModeAuto;
+    switch (ownerElement->scrollingMode()) {
+    case ScrollbarAuto:
+        scrollingMode = WebFrameOwnerProperties::ScrollingModeAuto;
+        break;
+    case ScrollbarAlwaysOff:
+        scrollingMode = WebFrameOwnerProperties::ScrollingModeAlwaysOff;
+        break;
+    case ScrollbarAlwaysOn:
+        scrollingMode = WebFrameOwnerProperties::ScrollingModeAlwaysOn;
+        break;
+    }
+
+    WebFrameOwnerProperties ownerProperties(scrollingMode, marginWidth, marginHeight);
+    WebLocalFrameImpl* webframeChild = toWebLocalFrameImpl(m_client->createChildFrame(this, scope, name, static_cast<WebSandboxFlags>(ownerElement->sandboxFlags()), ownerProperties));
     if (!webframeChild)
         return nullptr;