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

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index c77a394480bee1982c3a71cc3d41637ba68c01b0..88d3ab031a3f540d3494ca8044fb906c3294adef 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -36,6 +36,7 @@
 #include "WebDOMMessageEvent.h"
 #include "WebDataSource.h"
 #include "WebFrame.h"
+#include "WebFrameOwnerProperties.h"
 #include "WebHistoryCommitType.h"
 #include "WebHistoryItem.h"
 #include "WebIconURL.h"
@@ -149,7 +150,7 @@ public:
     // until frameDetached() is called on it.
     // Note: If you override this, you should almost certainly be overriding
     // frameDetached().
-    virtual WebFrame* createChildFrame(WebLocalFrame* parent, WebTreeScopeType, const WebString& frameName, WebSandboxFlags sandboxFlags) { return nullptr; }
+    virtual WebFrame* createChildFrame(WebLocalFrame* parent, WebTreeScopeType, const WebString& frameName, WebSandboxFlags sandboxFlags, const WebFrameOwnerProperties&) { return nullptr; }
 
     // This frame set its opener to null, disowning it.
     // See http://html.spec.whatwg.org/#dom-opener.
@@ -179,6 +180,15 @@ public:
     // The sandbox flags have changed for a child frame of this frame.
     virtual void didChangeSandboxFlags(WebFrame* childFrame, WebSandboxFlags flags) { }
 
+    // The "marginwidth" property has changed for a child frame of this frame.
+    virtual void didChangeMarginWidth(WebFrame* childFrame, int newMarginWidth) {}
+
+    // The "marginheight" property has changed for a child frame of this frame.
+    virtual void didChangeMarginHeight(WebFrame* childFrame, int newMarginHeight) {}
+
+    // The "scrolling" property has changed for a child frame of this frame.
+    virtual void didChangeScrollingMode(WebFrame* childFrame, WebFrameOwnerProperties::ScrollingMode) {}
+
     // Called when a watched CSS selector matches or stops matching.
     virtual void didMatchCSS(WebLocalFrame*, const WebVector<WebString>& newlyMatchingSelectors, const WebVector<WebString>& stoppedMatchingSelectors) { }