[safe browsing] Switch to independent cache lifetimes for gethash items.

chrome/browser/safe_browsing/protocol_manager.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_PROTOCOL_MANAGER_H_
 #define CHROME_BROWSER_SAFE_BROWSING_PROTOCOL_MANAGER_H_
 
 // A class that implements Chrome's interface with the SafeBrowsing protocol.
 // See https://developers.google.com/safe-browsing/developers_guide_v2 for
 // protocol details.
@@ skipping 41 matching lines @@
 class SBProtocolManagerFactory;
 class SafeBrowsingProtocolManagerDelegate;
 
 class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
                                     public base::NonThreadSafe {
  public:
   // FullHashCallback is invoked when GetFullHash completes.
   // Parameters:
   //   - The vector of full hash results. If empty, indicates that there
   //     were no matches, and that the resource is safe.
-  //   - Whether the result can be cached. This may not be the case when
-  //     the result did not come from the SB server, for example.
+  //   - The cache lifetime of the result. A lifetime of 0 indicates the results
+  //     should not be cached.
   typedef base::Callback<void(const std::vector<SBFullHashResult>&,
-                              bool)> FullHashCallback;
+                              const base::TimeDelta&)> FullHashCallback;
 
   virtual ~SafeBrowsingProtocolManager();
 
   // Makes the passed |factory| the factory used to instantiate
   // a SafeBrowsingService. Useful for tests.
   static void RegisterFactory(SBProtocolManagerFactory* factory) {
     factory_ = factory;
   }
 
   // Create an instance of the safe browsing protocol manager.
@@ skipping 358 matching lines @@
   // call at a later time.
   virtual void AddChunks(const std::string& list, SBChunkList* chunks,
                          AddChunksCallback callback) = 0;
 
   // Delete chunks from the database.
   virtual void DeleteChunks(
       std::vector<SBChunkDelete>* delete_chunks) = 0;
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_PROTOCOL_MANAGER_H_