Revert of Move base/prefs to components/prefs

base/prefs/pref_registry.cc

Index: base/prefs/pref_registry.cc
diff --git a/base/prefs/pref_registry.cc b/base/prefs/pref_registry.cc
new file mode 100644
index 0000000000000000000000000000000000000000..77fb9a59ad0b068cb6c05ec9b4c03110657554b0
--- /dev/null
+++ b/base/prefs/pref_registry.cc
@@ -0,0 +1,67 @@
+// 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.
+
+#include "base/prefs/pref_registry.h"
+
+#include "base/logging.h"
+#include "base/prefs/default_pref_store.h"
+#include "base/prefs/pref_store.h"
+#include "base/stl_util.h"
+#include "base/values.h"
+
+PrefRegistry::PrefRegistry()
+    : defaults_(new DefaultPrefStore()) {
+}
+
+PrefRegistry::~PrefRegistry() {
+}
+
+uint32_t PrefRegistry::GetRegistrationFlags(
+    const std::string& pref_name) const {
+  const auto& it = registration_flags_.find(pref_name);
+  if (it == registration_flags_.end())
+    return NO_REGISTRATION_FLAGS;
+  return it->second;
+}
+
+scoped_refptr<PrefStore> PrefRegistry::defaults() {
+  return defaults_.get();
+}
+
+PrefRegistry::const_iterator PrefRegistry::begin() const {
+  return defaults_->begin();
+}
+
+PrefRegistry::const_iterator PrefRegistry::end() const {
+  return defaults_->end();
+}
+
+void PrefRegistry::SetDefaultPrefValue(const std::string& pref_name,
+                                       base::Value* value) {
+  DCHECK(value);
+  const base::Value* current_value = NULL;
+  DCHECK(defaults_->GetValue(pref_name, &current_value))
+      << "Setting default for unregistered pref: " << pref_name;
+  DCHECK(value->IsType(current_value->GetType()))
+      << "Wrong type for new default: " << pref_name;
+
+  defaults_->ReplaceDefaultValue(pref_name, make_scoped_ptr(value));
+}
+
+void PrefRegistry::RegisterPreference(const std::string& path,
+                                      base::Value* default_value,
+                                      uint32_t flags) {
+  base::Value::Type orig_type = default_value->GetType();
+  DCHECK(orig_type != base::Value::TYPE_NULL &&
+         orig_type != base::Value::TYPE_BINARY) <<
+         "invalid preference type: " << orig_type;
+  DCHECK(!defaults_->GetValue(path, NULL)) <<
+      "Trying to register a previously registered pref: " << path;
+  DCHECK(!ContainsKey(registration_flags_, path)) <<
+      "Trying to register a previously registered pref: " << path;
+
+  defaults_->SetDefaultValue(path, make_scoped_ptr(default_value));
+  if (flags != NO_REGISTRATION_FLAGS)
+    registration_flags_[path] = flags;
+}