(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 c5e86452bda6fdf90a35d11a7361475580564615..688bb4d1f3e58e2cb6b141dd7de08000337287e8 100644
--- a/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -109,6 +109,9 @@ HTMLFrameOwnerElement::HTMLFrameOwnerElement(const QualifiedName& tagName, Docum
     , m_contentFrame(nullptr)
     , m_widget(nullptr)
     , m_sandboxFlags(SandboxNone)
+    , m_scrollingMode(ScrollbarAuto)
+    , m_marginWidth(-1)
+    , m_marginHeight(-1)
 {
 }
 
@@ -191,11 +194,46 @@ void HTMLFrameOwnerElement::setSandboxFlags(SandboxFlags flags)
         document().frame()->loader().client()->didChangeSandboxFlags(contentFrame(), flags);
 }
 
+void HTMLFrameOwnerElement::setScrollingMode(ScrollbarMode scrollbarMode)
+{
+    m_scrollingMode = scrollbarMode;
+    if (isPluginElement())
+        return;
+
+    frameOwnerPropertiesChanged();
+}
+
+void HTMLFrameOwnerElement::setMarginWidth(int marginWidth)
+{
+    m_marginWidth = marginWidth;
+    if (isPluginElement())
+        return;
+
+    frameOwnerPropertiesChanged();
+}
+
+void HTMLFrameOwnerElement::setMarginHeight(int marginHeight)
+{
+    m_marginHeight = marginHeight;
+    if (isPluginElement())
+        return;
+
+    frameOwnerPropertiesChanged();
+}
+
 bool HTMLFrameOwnerElement::isKeyboardFocusable() const
 {
     return m_contentFrame && HTMLElement::isKeyboardFocusable();
 }
 
+void HTMLFrameOwnerElement::frameOwnerPropertiesChanged()
+{
+    // 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()->didChangeFrameOwnerProperties(contentFrame(), m_scrollingMode, m_marginWidth, m_marginHeight);
+}
+
 void HTMLFrameOwnerElement::dispatchLoad()
 {
     dispatchEvent(Event::create(EventTypeNames::load));