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

Source/core/loader/FrameLoaderClient.h

Index: Source/core/loader/FrameLoaderClient.h
diff --git a/Source/core/loader/FrameLoaderClient.h b/Source/core/loader/FrameLoaderClient.h
index 4bb8b0c4abd18e9d3578d56b1cc5206127b63d65..5636e42efea1fcb2cf2e1ada0e7fad0e37d77293 100644
--- a/Source/core/loader/FrameLoaderClient.h
+++ b/Source/core/loader/FrameLoaderClient.h
@@ -132,6 +132,10 @@ public:
     // Will be called when |PerformanceTiming| events are updated
     virtual void didChangePerformanceTiming() { }
 
+    virtual void didChangeScrollingMode(Frame*, ScrollbarMode) {}
+    virtual void didChangeMarginWidth(Frame*, int) {}
+    virtual void didChangeMarginHeight(Frame*, int) {}
+
     // Transmits the change in the set of watched CSS selectors property
     // that match any element on the frame.
     virtual void selectorMatchChanged(const Vector<String>& addedSelectors, const Vector<String>& removedSelectors) = 0;