Move preference MACs to the protected preference stores.

chrome/browser/prefs/pref_hash_store_transaction.h

 // Copyright 2014 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_PREFS_PREF_HASH_STORE_TRANSACTION_H_
 #define CHROME_BROWSER_PREFS_PREF_HASH_STORE_TRANSACTION_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 49 matching lines @@
   virtual ValueState CheckSplitValue(
       const std::string& path,
       const base::DictionaryValue* initial_split_value,
       std::vector<std::string>* invalid_keys) const = 0;
 
   // Stores hashes for the |value| of the split preference at |path|.
   // |split_value| being an empty dictionary or NULL is equivalent.
   virtual void StoreSplitHash(
       const std::string& path,
       const base::DictionaryValue* split_value) = 0;
+
+  // Retrieves the stored hash for the preference at |path|. If there is no
+  // stored hash the result is NULL. If |path| is a split preference the result
+  // is a DictionaryValue whose keys are keys in the split preference and whose
+  // values are MACs of the corresponding values in the split preference.
+  // Otherwise the result is a StringValue containing a MAC of the preference
+  // value.
+  virtual const base::Value* GetHash(const std::string& path) const = 0;
+
+  // Sets the hash for the preference at |path|. |hash| may be a
+  // DictionaryValue or StringValue as returned by GetHash() or it may be NULL
+  // (which will clear any previously stored MAC).
+  // The (in)validity of the super MAC will be maintained by this call.
+  virtual void ImportHash(const std::string& path, const base::Value* hash) = 0;
+
+  // Removes the stored hash for the preference at |path|. The (in)validity of
+  // the super MAC will be maintained by this call.
+  virtual void ClearHash(const std::string& path) = 0;
+
+  // Forces the super MAC (if used by this store) to be updated. Returns true if
+  // this results in a change to the store contents.
+  virtual bool StampSuperMac() = 0;
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_HASH_STORE_TRANSACTION_H_