Double-check safe-browsing database validity on update failure.

chrome/browser/safe_browsing/safe_browsing_store.h

 // Copyright (c) 2011 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_SAFE_BROWSING_STORE_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_STORE_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 202 matching lines @@
   virtual void GetAddChunks(std::vector<int32>* out) = 0;
   virtual void SetSubChunk(int32 chunk_id) = 0;
   virtual bool CheckSubChunk(int32 chunk_id) = 0;
   virtual void GetSubChunks(std::vector<int32>* out) = 0;
 
   // Delete the indicated chunk_id.  The chunk will continue to be
   // visible until the end of the transaction.
   virtual void DeleteAddChunk(int32 chunk_id) = 0;
   virtual void DeleteSubChunk(int32 chunk_id) = 0;
 
+  // May be called during update to verify that the storage is valid.
+  // Return true if the store seems valid.  If corruption is detected,
+  // calls the corruption callback and return false.
+  // NOTE(shess): When storage was SQLite, there was no guarantee that
+  // a structurally sound database actually contained valid data,
+  // whereas SafeBrowsingStoreFile checksums the data.  For now, this
+  // distinction doesn't matter.
+  virtual bool CheckValidity() = 0;
+
   // Pass the collected chunks through SBPRocessSubs() and commit to
   // permanent storage.  The resulting add prefixes and hashes will be
   // stored in |add_prefixes_result| and |add_full_hashes_result|.
   // |pending_adds| is the set of full hashes which have been received
   // since the previous update, and is provided as a convenience
   // (could be written via WriteAddHash(), but that would flush the
   // chunk to disk).  |prefix_misses| is the set of prefixes where the
   // |GetHash()| request returned no full hashes, used for diagnostic
   // purposes.
   virtual bool FinishUpdate(
       const std::vector<SBAddFullHash>& pending_adds,
       const std::set<SBPrefix>& prefix_misses,
       SBAddPrefixes* add_prefixes_result,
       std::vector<SBAddFullHash>* add_full_hashes_result) = 0;
 
   // Cancel the update in process and remove any temporary disk
   // storage, leaving the original data unmodified.
   virtual bool CancelUpdate() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingStore);
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_STORE_H_