Revert of Revert of Adding CopresenceState

components/copresence/tokens.cc

+// Copyright 2014 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/copresence/tokens.h"
+
+namespace copresence {
+
+TransmittedToken::TransmittedToken()
+    : medium(TOKEN_MEDIUM_UNKNOWN),
+      broadcast_confirmed(false) {}
+
+ReceivedToken::ReceivedToken()
+    : medium(TOKEN_MEDIUM_UNKNOWN),
+      valid(UNKNOWN) {}
+
+ReceivedToken::ReceivedToken(const std::string& id,
+                             TokenMedium medium,
+                             base::Time last_time)
+    : id(id),
+      medium(medium),
+      last_time(last_time),
+      valid(UNKNOWN) {}
+
+}  // namespace copresence