Implement a ResourceThrottle for URL overriding in Chrome on Android.

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 ecfdb7a7498bece55e73dc80d3a3c972bc3f73fd..082273cc070d76f107f1f63564a2dae22e2bdd8a 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -33,6 +33,7 @@ class BrowserContext;
 class ColorChooser;
 class DownloadItem;
 class JavaScriptDialogCreator;
+struct Referrer;
 class RenderViewHost;
 class WebContents;
 class WebIntentsDispatcher;
@@ -77,6 +78,14 @@ class CONTENT_EXPORT WebContentsDelegate {
   virtual WebContents* OpenURLFromTab(WebContents* source,
                                       const OpenURLParams& params);
 
+  // Called for top-level navigation to decide whether the navigation should be
+  // allowed to proceed.
+  virtual bool ShouldIgnoreNavigation(
+      WebContents* source,
+      const GURL& url,
+      const content::Referrer& referrer,
+      bool is_content_initiated);
+
   // 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, and is any combination of the