Revert of Move base/prefs to components/prefs

base/prefs/pref_value_map.h

Index: base/prefs/pref_value_map.h
diff --git a/base/prefs/pref_value_map.h b/base/prefs/pref_value_map.h
index e1ec94aa3fad9658f854129d294df57e97a97e6b..349fe6852010605cdfb7c174cb66cec03101695c 100644
--- a/base/prefs/pref_value_map.h
+++ b/base/prefs/pref_value_map.h
@@ -2,6 +2,90 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(brettw) remove this forwarding header when prefs is completely moved to
-// components.
-#include "components/prefs/pref_value_map.h"
+#ifndef BASE_PREFS_PREF_VALUE_MAP_H_
+#define BASE_PREFS_PREF_VALUE_MAP_H_
+
+#include <string>
+#include <vector>
+
+#include "base/containers/scoped_ptr_hash_map.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/prefs/base_prefs_export.h"
+
+namespace base {
+class Value;
+}
+
+// A generic string to value map used by the PrefStore implementations.
+class BASE_PREFS_EXPORT PrefValueMap {
+ public:
+  using Map = base::ScopedPtrHashMap<std::string, scoped_ptr<base::Value>>;
+  using iterator = Map::iterator;
+  using const_iterator = Map::const_iterator;
+
+  PrefValueMap();
+  virtual ~PrefValueMap();
+
+  // Gets the value for |key| and stores it in |value|. Ownership remains with
+  // the map. Returns true if a value is present. If not, |value| is not
+  // touched.
+  bool GetValue(const std::string& key, const base::Value** value) const;
+  bool GetValue(const std::string& key, base::Value** value);
+
+  // Sets a new |value| for |key|. |value| must be non-null. Returns true if the
+  // value changed.
+  bool SetValue(const std::string& key, scoped_ptr<base::Value> value);
+
+  // Removes the value for |key| from the map. Returns true if a value was
+  // removed.
+  bool RemoveValue(const std::string& key);
+
+  // Clears the map.
+  void Clear();
+
+  // Swaps the contents of two maps.
+  void Swap(PrefValueMap* other);
+
+  iterator begin();
+  iterator end();
+  const_iterator begin() const;
+  const_iterator end() const;
+
+  // Gets a boolean value for |key| and stores it in |value|. Returns true if
+  // the value was found and of the proper type.
+  bool GetBoolean(const std::string& key, bool* value) const;
+
+  // Sets the value for |key| to the boolean |value|.
+  void SetBoolean(const std::string& key, bool value);
+
+  // Gets a string value for |key| and stores it in |value|. Returns true if
+  // the value was found and of the proper type.
+  bool GetString(const std::string& key, std::string* value) const;
+
+  // Sets the value for |key| to the string |value|.
+  void SetString(const std::string& key, const std::string& value);
+
+  // Gets an int value for |key| and stores it in |value|. Returns true if
+  // the value was found and of the proper type.
+  bool GetInteger(const std::string& key, int* value) const;
+
+  // Sets the value for |key| to the int |value|.
+  void SetInteger(const std::string& key, const int value);
+
+  // Sets the value for |key| to the double |value|.
+  void SetDouble(const std::string& key, const double value);
+
+  // Compares this value map against |other| and stores all key names that have
+  // different values in |differing_keys|. This includes keys that are present
+  // only in one of the maps.
+  void GetDifferingKeys(const PrefValueMap* other,
+                        std::vector<std::string>* differing_keys) const;
+
+ private:
+  Map prefs_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefValueMap);
+};
+
+#endif  // BASE_PREFS_PREF_VALUE_MAP_H_