Shortcut cross-process frame transfers to avoid pending NavigationEntries.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index f6a04a5c40ff310206abf9336b81b88173cca69c..d8f6ac249228f33f5d7fefa326c6c41fcb4e1e87 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -84,6 +84,11 @@ class CONTENT_EXPORT WebContentsDelegate {
   virtual WebContents* OpenURLFromTab(WebContents* source,
                                       const OpenURLParams& params);
 
+  // Allows the delegate to optionally cancel navigations that attempt to
+  // transfer to a different process between the start of the network load and
+  // commit.  Defaults to true.
+  virtual bool ShouldTransferNavigation();
+
   // Called to inform the delegate that the WebContents's navigation state
   // changed. The |changed_flags| indicates the parts of the navigation state
   // that have been updated.