Implement a ResourceThrottle for URL overriding in Chrome on Android.

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 0136e6a61c31dc67a442649cc84193922ce488a7..f869ca0e0cdae39fb2ed283a65f123374baca1b9 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -389,6 +389,11 @@ class WebContents : public PageNavigator {
 
   // Does this have an opener associated with it?
   virtual bool HasOpener() const = 0;
+
+  // Should we ignore this top level navigation?
+  virtual bool ShouldIgnoreNavigation(const GURL& url,
+                                      const content::Referrer& referrer,
+                                      bool is_content_initiated) = 0;
 };
 
 }  // namespace content