Add a chrome://interstitials page.

chrome/browser/safe_browsing/safe_browsing_blocking_page.h

Index: chrome/browser/safe_browsing/safe_browsing_blocking_page.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_blocking_page.h b/chrome/browser/safe_browsing/safe_browsing_blocking_page.h
index b5ac288a785ff312ccd2202e80151ac0f8b63f72..5c97bb0faa27b5738367d5efcc39d7f540d4d520 100644
--- a/chrome/browser/safe_browsing/safe_browsing_blocking_page.h
+++ b/chrome/browser/safe_browsing/safe_browsing_blocking_page.h
@@ -61,6 +61,13 @@ class SafeBrowsingBlockingPage : public content::InterstitialPageDelegate {
 
   virtual ~SafeBrowsingBlockingPage();
 
+  // Creates a blocking page. Use ShowBlockingPage if you don't need to access
+  // the blocking page directly.
+  static SafeBrowsingBlockingPage* CreateBlockingPage(
+      SafeBrowsingUIManager* ui_manager,
+      content::WebContents* web_contents,
+      const UnsafeResource& unsafe_resource);
+
   // Shows a blocking page warning the user about phishing/malware for a
   // specific resource.
   // You can call this method several times, if an interstitial is already