Pref service: expose all read-only PrefStores through Mojo

services/preferences/public/cpp/preferences_struct_traits.cc

Index: services/preferences/public/cpp/preferences_struct_traits.cc
diff --git a/services/preferences/public/cpp/preferences_struct_traits.cc b/services/preferences/public/cpp/preferences_struct_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..31b0dfb6c1ac9f9e86062b737ded6959ec6848cd
--- /dev/null
+++ b/services/preferences/public/cpp/preferences_struct_traits.cc
@@ -0,0 +1,64 @@
+// 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 "services/preferences/public/cpp/preferences_struct_traits.h"
+
+namespace mojo {
+
+using PrefStoreType = prefs::mojom::PrefStoreType;
+
+PrefStoreType EnumTraits<PrefStoreType, PrefValueStore::PrefStoreType>::ToMojom(
+    PrefValueStore::PrefStoreType input) {
+  switch (input) {
+    case PrefValueStore::INVALID_STORE:
+      break;
+    case PrefValueStore::MANAGED_STORE:
+      return PrefStoreType::MANAGED;
+    case PrefValueStore::SUPERVISED_USER_STORE:
+      return PrefStoreType::SUPERVISED_USER;
+    case PrefValueStore::EXTENSION_STORE:
+      return PrefStoreType::EXTENSION;
+    case PrefValueStore::COMMAND_LINE_STORE:
+      return PrefStoreType::COMMAND_LINE;
+    case PrefValueStore::USER_STORE:
+      return PrefStoreType::USER;
+    case PrefValueStore::RECOMMENDED_STORE:
+      return PrefStoreType::RECOMMENDED;
+    case PrefValueStore::DEFAULT_STORE:
+      return PrefStoreType::DEFAULT;
+  }
+  NOTREACHED();
+  return {};
+}
+
+bool EnumTraits<PrefStoreType, PrefValueStore::PrefStoreType>::FromMojom(
+    PrefStoreType input,
+    PrefValueStore::PrefStoreType* output) {
+  switch (input) {
+    case PrefStoreType::MANAGED:
+      *output = PrefValueStore::MANAGED_STORE;
+      return true;
+    case PrefStoreType::SUPERVISED_USER:
+      *output = PrefValueStore::SUPERVISED_USER_STORE;
+      return true;
+    case PrefStoreType::EXTENSION:
+      *output = PrefValueStore::EXTENSION_STORE;
+      return true;
+    case PrefStoreType::COMMAND_LINE:
+      *output = PrefValueStore::COMMAND_LINE_STORE;
+      return true;
+    case PrefStoreType::USER:
+      *output = PrefValueStore::USER_STORE;
+      return true;
+    case PrefStoreType::RECOMMENDED:
+      *output = PrefValueStore::RECOMMENDED_STORE;
+      return true;
+    case PrefStoreType::DEFAULT:
+      *output = PrefValueStore::DEFAULT_STORE;
+      return true;
+  }
+  return false;
+}
+
+}  // namespace mojo