Add a mojo interface for AccountId

components/signin/public/interfaces/account_id_traits.h

Index: components/signin/public/interfaces/account_id_traits.h
diff --git a/components/signin/public/interfaces/account_id_traits.h b/components/signin/public/interfaces/account_id_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..cc1d39de91773289c8fe34eaeb1a56d05b334390
--- /dev/null
+++ b/components/signin/public/interfaces/account_id_traits.h
@@ -0,0 +1,107 @@
+// 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.
+
+#ifndef COMPONENTS_SIGNIN_PUBLIC_INTERFACES_ACCOUNT_ID_TRAITS_H_
+#define COMPONENTS_SIGNIN_PUBLIC_INTERFACES_ACCOUNT_ID_TRAITS_H_
+
+#include <string>
+
+#include "components/signin/core/account_id/account_id.h"
+#include "components/signin/public/interfaces/account_id.mojom.h"
+
+namespace mojo {
+
+template <>
+struct EnumTraits<signin::mojom::AccountType, AccountType> {
+  static signin::mojom::AccountType ToMojom(AccountType input) {
+    switch (input) {
+      case AccountType::UNKNOWN:
+        return signin::mojom::AccountType::UNKNOWN;
+      case AccountType::GOOGLE:
+        return signin::mojom::AccountType::GOOGLE;
+      case AccountType::ACTIVE_DIRECTORY:
+        return signin::mojom::AccountType::ACTIVE_DIRECTORY;
+    }
+    NOTREACHED();
+    return signin::mojom::AccountType::UNKNOWN;
+  }
+
+  static bool FromMojom(signin::mojom::AccountType input,
+                        AccountType* out) {
+    switch (input) {
+      case signin::mojom::AccountType::UNKNOWN:
+        *out = AccountType::UNKNOWN;
+        return true;
+      case signin::mojom::AccountType::GOOGLE:
+        *out = AccountType::GOOGLE;
+        return true;
+      case signin::mojom::AccountType::ACTIVE_DIRECTORY:
+        *out = AccountType::ACTIVE_DIRECTORY;
+        return true;
+    }
+    NOTREACHED();
+    return false;
+  }
+};
+
+
+template <>
+struct StructTraits<signin::mojom::AccountIdDataView, AccountId> {
+  static AccountType account_type(const AccountId& r) {
+    return r.GetAccountType();
+  }
+  static std::string id(const AccountId& r) {
+    switch (r.GetAccountType()) {
+      case AccountType::GOOGLE:
+        return r.GetGaiaId();
+      case AccountType::ACTIVE_DIRECTORY:
+        return r.GetObjGuid();
+      case AccountType::UNKNOWN:
+        // UNKNOWN type is used for users that have only email (e.g. in tests
+        // or legacy users that have not run through migration code).
+        // Return an empty string for such accounts.
+        return std::string();
+    }
+    NOTREACHED();
+    return std::string();
+  }
+  static std::string user_email(const AccountId& r) {
+    return r.GetUserEmail();
+  }
+
+  static bool Read(signin::mojom::AccountIdDataView data, AccountId* out) {
+    AccountType account_type;
+    std::string id;
+    std::string user_email;
+    if (!data.ReadAccountType(&account_type) ||
+        !data.ReadId(&id) ||
+        !data.ReadUserEmail(&user_email)) {
+      return false;
+    }
+
+    switch (account_type) {
+      case AccountType::GOOGLE:
+        *out = AccountId::FromUserEmailGaiaId(user_email, id);
+        break;
+      case AccountType::ACTIVE_DIRECTORY:
+        *out = AccountId::AdFromUserEmailObjGuid(user_email, id);
+        break;
+      case AccountType::UNKNOWN:
+        // UNKNOWN type is used for users that have only email (e.g. in tests
+        // or legacy users that have not run through migration code).
+        // Bail if there is no user email.
+        if (user_email.empty())
+          return false;
+
+        *out = AccountId::FromUserEmail(user_email);
+        break;
+    }
+
+    return out->is_valid();
+  }
+};
+
+}  // namespace mojo
+
+#endif  // COMPONENTS_SIGNIN_PUBLIC_INTERFACES_ACCOUNT_ID_TRAITS_H_