Store base::Value in ContentSettingPatternSource instead of an enum

components/content_settings/core/common/content_settings_utils.cc

+// Copyright 2017 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 "components/content_settings/core/common/content_settings_utils.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/values.h"
+
+namespace content_settings {
+
+namespace {
+
+// Converts a |Value| to a |ContentSetting|. Returns true if |value| encodes
+// a valid content setting, false otherwise. Note that |CONTENT_SETTING_DEFAULT|
+// is encoded as a NULL value, so it is not allowed as an integer value.
+bool ParseContentSettingValue(const base::Value* value,
+                              ContentSetting* setting) {
+  if (!value) {
+    *setting = CONTENT_SETTING_DEFAULT;
+    return true;
+  }
+  int int_value = -1;
+  if (!value->GetAsInteger(&int_value))
+    return false;
+  *setting = IntToContentSetting(int_value);
+  return *setting != CONTENT_SETTING_DEFAULT;
+}
+
+}  // namespace
+
+ContentSetting ValueToContentSetting(const base::Value* value) {
+  ContentSetting setting = CONTENT_SETTING_DEFAULT;
+  bool valid = ParseContentSettingValue(value, &setting);
+  DCHECK(valid);
+  return setting;
+}
+
+std::unique_ptr<base::Value> ContentSettingToValue(ContentSetting setting) {
+  if (setting <= CONTENT_SETTING_DEFAULT ||
+      setting >= CONTENT_SETTING_NUM_SETTINGS) {
+    return nullptr;
+  }
+  return base::MakeUnique<base::Value>(setting);
+}
+
+}  // namespace content_settings