Propagate scrolling/marginwidth/marginheight property values to child frame.

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index 54a8fe9f1a705c21fb4b23623126510b0005994f..6a80205872e5aa2fd39bdd6acd19386fad33d20b 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/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 has set its opener to another frame, or disowned the opener
     // if opener is null. See http://html.spec.whatwg.org/#dom-opener.
@@ -174,6 +175,9 @@ public:
     // The sandbox flags have changed for a child frame of this frame.
     virtual void didChangeSandboxFlags(WebFrame* childFrame, WebSandboxFlags flags) { }
 
+    // Some frame owner properties have changed for a child frame of this frame.  Frame owner properties currently include: scrolling, marginwidth and marginheight.

[alexmos, 2015/10/02 21:24:20]

nit: might look neater with a line break after first sentence.

[lazyboy, 2015/10/05 22:16:09]

Done.

+    virtual void didChangeFrameOwnerProperties(WebFrame* childFrame, const WebFrameOwnerProperties&) { }
+
     // Called when a watched CSS selector matches or stops matching.
     virtual void didMatchCSS(WebLocalFrame*, const WebVector<WebString>& newlyMatchingSelectors, const WebVector<WebString>& stoppedMatchingSelectors) { }