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

Source/core/html/HTMLFrameOwnerElement.cpp

Index: Source/core/html/HTMLFrameOwnerElement.cpp
diff --git a/Source/core/html/HTMLFrameOwnerElement.cpp b/Source/core/html/HTMLFrameOwnerElement.cpp
index 1833cc61cb2a899e2bb4319a450b82f0a8fdb14b..cb9df157f90df8a71f2824b30d95a9c10b2b7bf3 100644
--- a/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -108,6 +108,9 @@ HTMLFrameOwnerElement::HTMLFrameOwnerElement(const QualifiedName& tagName, Docum
     , m_contentFrame(nullptr)
     , m_widget(nullptr)
     , m_sandboxFlags(SandboxNone)
+    , m_scrollingMode(ScrollbarAuto)
+    , m_marginWidth(-1)
+    , m_marginHeight(-1)
 {
 }
 
@@ -190,6 +193,33 @@ void HTMLFrameOwnerElement::setSandboxFlags(SandboxFlags flags)
         document().frame()->loader().client()->didChangeSandboxFlags(contentFrame(), flags);
 }
 
+void HTMLFrameOwnerElement::setScrollingMode(ScrollbarMode scrollbarMode)
+{
+    m_scrollingMode = scrollbarMode;
+    // Don't notify about updates if contentFrame() is null, for example when
+    // the subframe hasn't been created yet.
+    if (contentFrame())
+        document().frame()->loader().client()->didChangeScrollingMode(contentFrame(), scrollbarMode);
+}
+
+void HTMLFrameOwnerElement::setMarginWidth(int marginWidth)
+{
+    m_marginWidth = marginWidth;
+    // Don't notify about updates if contentFrame() is null, for example when
+    // the subframe hasn't been created yet.
+    if (contentFrame())
+        document().frame()->loader().client()->didChangeMarginWidth(contentFrame(), m_marginWidth);
+}
+
+void HTMLFrameOwnerElement::setMarginHeight(int marginHeight)
+{
+    m_marginHeight = marginHeight;
+    // Don't notify about updates if contentFrame() is null, for example when
+    // the subframe hasn't been created yet.
+    if (contentFrame())
+        document().frame()->loader().client()->didChangeMarginHeight(contentFrame(), m_marginHeight);
+}
+
 bool HTMLFrameOwnerElement::isKeyboardFocusable() const
 {
     return m_contentFrame && HTMLElement::isKeyboardFocusable();