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

Source/web/RemoteBridgeFrameOwner.h

Index: Source/web/RemoteBridgeFrameOwner.h
diff --git a/Source/web/RemoteBridgeFrameOwner.h b/Source/web/RemoteBridgeFrameOwner.h
index a022f820f100afb064a97e947597d6924aae8410..8db447fab31976219f33756b8ca94bc7c9461e29 100644
--- a/Source/web/RemoteBridgeFrameOwner.h
+++ b/Source/web/RemoteBridgeFrameOwner.h
@@ -6,6 +6,7 @@
 #define RemoteBridgeFrameOwner_h
 
 #include "core/frame/FrameOwner.h"
+#include "platform/scroll/ScrollTypes.h"
 #include "web/WebLocalFrameImpl.h"
 
 namespace blink {
@@ -50,6 +51,14 @@ public:
         // TODO(dcheng): Implement.
     }
 
+    void setScrollingMode(ScrollbarMode mode) { m_scrolling = mode; }
+    void setMarginWidth(int marginWidth) { m_marginWidth = marginWidth; }
+    void setMarginHeight(int marginHeight) { m_marginHeight = marginHeight; }
+
+    ScrollbarMode scrollingMode() const override { return m_scrolling; }
+    int marginWidth() const override { return m_marginWidth; }
+    int marginHeight() const override { return m_marginHeight; }
+
     DECLARE_VIRTUAL_TRACE();
 
 private:
@@ -57,6 +66,9 @@ private:
 
     RefPtrWillBeMember<WebLocalFrameImpl> m_frame;
     SandboxFlags m_sandboxFlags;
+    ScrollbarMode m_scrolling;
+    int m_marginWidth;
+    int m_marginHeight;
 };
 
 DEFINE_TYPE_CASTS(RemoteBridgeFrameOwner, FrameOwner, owner, !owner->isLocal(), !owner.isLocal());