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 6c3b6f8198fcc99e88a8ed31b310be0b455b44ff..cd9a9b16fea9f8b55745606f0af69755cb6661c6 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -38,6 +38,7 @@ class WebIntentsDispatcher;
 struct ContextMenuParams;
 struct FileChooserParams;
 struct NativeWebKeyboardEvent;
+struct Referrer;
 struct SSLStatus;
 }
 
@@ -78,6 +79,14 @@ 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& validated_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