Introduce per-tab preferences service.

chrome/browser/prefs/pref_value_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_PREFS_PREF_VALUE_STORE_H_
 #define CHROME_BROWSER_PREFS_PREF_VALUE_STORE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 152 matching lines @@
     scoped_refptr<PrefStore> pref_store_;
 
     // Type of the pref store.
     PrefStoreType type_;
 
     DISALLOW_COPY_AND_ASSIGN(PrefStoreKeeper);
   };
 
   typedef std::map<std::string, base::Value::Type> PrefTypeMap;
 
+  friend class PrefService;

[Mattias Nissler (ping if slow), 2011/11/16 12:08:04]

Ah, needed for accessing pref_sync_associator_. As mentioned in the other
comment, we should probably just remove the PrefModelAssociator reference from
PrefValueStore.

[mnaganov (inactive), 2011/11/17 16:50:58]

Removed.

   friend class PrefValueStorePolicyRefreshTest;
   FRIEND_TEST_ALL_PREFIXES(PrefValueStorePolicyRefreshTest, TestPolicyRefresh);
   FRIEND_TEST_ALL_PREFIXES(PrefValueStorePolicyRefreshTest,
                            TestRefreshPolicyPrefsCompletion);
   FRIEND_TEST_ALL_PREFIXES(PrefValueStorePolicyRefreshTest,
                            TestConcurrentPolicyRefresh);
 
   // Returns true if the preference with the given name has a value in the
   // given PrefStoreType, of the same value type as the preference was
   // registered with.
@@ skipping 63 matching lines @@
   // A mapping of preference names to their registered types.
   PrefTypeMap pref_types_;
 
   // True if not all of the PrefStores were initialized successfully.
   bool initialization_failed_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefValueStore);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_VALUE_STORE_H_