The optional Malware Details also collects HTTP cache information. See design...

chrome/browser/safe_browsing/safe_browsing_service.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // The Safe Browsing service is responsible for downloading anti-phishing and
 // anti-malware tables and checking urls against them.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_SERVICE_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_SERVICE_H_
 #pragma once
@@ skipping 215 matching lines @@
   // Log the user perceived delay caused by SafeBrowsing. This delay is the time
   // delta starting from when we would have started reading data from the
   // network, and ending when the SafeBrowsing check completes indicating that
   // the current page is 'safe'.
   void LogPauseDelay(base::TimeDelta time);
 
   // When a safebrowsing blocking page goes away, it calls this method
   // so the service can serialize and send MalwareDetails.
   virtual void ReportMalwareDetails(scoped_refptr<MalwareDetails> details);
 
+  // When the MalwareDetails is done, OnReportReady is called.

[lzheng, 2011/03/05 00:37:50]

Maybe more explanation on what is "MalwareDetails is done"?

[panayiotis, 2011/03/29 18:14:55]

Done.

+  virtual void OnReportReady(scoped_refptr<MalwareDetails> details);
+
   // Report hits to the unsafe contents (malware, phishing, unsafe download URL)
   // to the server. Can only be called on UI thread.
   void ReportSafeBrowsingHit(const GURL& malicious_url,
                              const GURL& page_url,
                              const GURL& referrer_url,
                              bool is_subresource,
                              UrlCheckResult threat_type);
 
  protected:
   // Creates the safe browsing service.  Need to initialize before using.
@@ skipping 201 matching lines @@
 class SafeBrowsingServiceFactory {
  public:
   SafeBrowsingServiceFactory() { }
   virtual ~SafeBrowsingServiceFactory() { }
   virtual SafeBrowsingService* CreateSafeBrowsingService() = 0;
  private:
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_SERVICE_H_