Preference provider implementation backed by JSON files in a directory.

chrome/browser/configuration_policy_provider.cc

+// Copyright (c) 2010 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 "chrome/browser/configuration_policy_provider.h"
+
+#include "base/values.h"
+#include "chrome/browser/configuration_policy_store.h"
+
+namespace {
+
+struct PolicyValueTreeMappingEntry {
+  ConfigurationPolicyStore::PolicyType policy_type;
+  Value::ValueType value_type;
+  const wchar_t* const name;
+};
+
+const PolicyValueTreeMappingEntry kPolicyValueTreeMapping[] = {
+  { ConfigurationPolicyStore::kPolicyHomePage,
+    Value::TYPE_STRING, L"homepage" },
+  { ConfigurationPolicyStore::kPolicyHomepageIsNewTabPage,
+    Value::TYPE_BOOLEAN, L"homepage_is_newtabpage" },
+  { ConfigurationPolicyStore::kPolicyCookiesEnabled,
+    Value::TYPE_BOOLEAN, L"cookies_enabled" }
+};
+
+}
+
+void DecodePolicyValueTree(DictionaryValue* policies,
+                           ConfigurationPolicyStore* store) {
+  for (size_t i = 0; i < arraysize(kPolicyValueTreeMapping); ++i) {
+    const PolicyValueTreeMappingEntry& entry(kPolicyValueTreeMapping[i]);
+    Value* value;
+    if (policies->Get(entry.name, &value) && value->IsType(entry.value_type))
+      store->Apply(entry.policy_type, value->DeepCopy());
+  }
+
+  // TODO (mnissler) Handle preference overrides once |ConfigurationPolicyStore|
+  // supports it.
+}