Convert TrackedPreferenceValidationDelegate into a mojo interface.

services/preferences/public/cpp/tracked_preference_validation_delegate_struct_traits.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 "services/preferences/public/cpp/tracked_preference_validation_delegate_struct_traits.h"
+
+namespace mojo {
+
+using MojomValueState =
+    prefs::mojom::TrackedPreferenceValidationDelegate_ValueState;
+
+MojomValueState
+EnumTraits<MojomValueState, ::PrefHashStoreTransaction::ValueState>::ToMojom(
+    PrefHashStoreTransaction::ValueState input) {
+  switch (input) {
+    case PrefHashStoreTransaction::UNCHANGED:
+      return MojomValueState::UNCHANGED;
+    case PrefHashStoreTransaction::CLEARED:
+      return MojomValueState::CLEARED;
+    case PrefHashStoreTransaction::SECURE_LEGACY:
+      return MojomValueState::SECURE_LEGACY;
+    case PrefHashStoreTransaction::CHANGED:
+      return MojomValueState::CHANGED;
+    case PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE:
+      return MojomValueState::UNTRUSTED_UNKNOWN_VALUE;
+    case PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE:
+      return MojomValueState::TRUSTED_UNKNOWN_VALUE;
+    case PrefHashStoreTransaction::TRUSTED_NULL_VALUE:
+      return MojomValueState::TRUSTED_NULL_VALUE;
+    case PrefHashStoreTransaction::UNSUPPORTED:
+      return MojomValueState::UNSUPPORTED;
+  }
+  NOTREACHED();
+  return {};
+}
+
+bool EnumTraits<MojomValueState, ::PrefHashStoreTransaction::ValueState>::
+    FromMojom(MojomValueState input,
+              PrefHashStoreTransaction::ValueState* output) {
+  switch (input) {
+    case MojomValueState::UNCHANGED:
+      *output = PrefHashStoreTransaction::UNCHANGED;
+      return true;
+    case MojomValueState::CLEARED:
+      *output = PrefHashStoreTransaction::CLEARED;
+      return true;
+    case MojomValueState::SECURE_LEGACY:
+      *output = PrefHashStoreTransaction::SECURE_LEGACY;
+      return true;
+    case MojomValueState::CHANGED:
+      *output = PrefHashStoreTransaction::CHANGED;
+      return true;
+    case MojomValueState::UNTRUSTED_UNKNOWN_VALUE:
+      *output = PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE;
+      return true;
+    case MojomValueState::TRUSTED_UNKNOWN_VALUE:
+      *output = PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE;
+      return true;
+    case MojomValueState::TRUSTED_NULL_VALUE:
+      *output = PrefHashStoreTransaction::TRUSTED_NULL_VALUE;
+      return true;
+    case MojomValueState::UNSUPPORTED:
+      *output = PrefHashStoreTransaction::UNSUPPORTED;
+      return true;
+  }
+  return false;

[dcheng, 2017/03/07 08:14:15]

Is the enum value validated before it's passed to EnumTraits?

[Sam McNally, 2017/03/08 00:06:53]

Yes.

[dcheng, 2017/03/08 00:22:08]

Maybe these sorts of things should be NOTREACHED() as well? *shrug*

+}
+
+}  // namespace mojo