Add AssignmentSource to BlimpClientContextImpl

blimp/client/public/session/assignment.cc

Index: blimp/client/public/session/assignment.cc
diff --git a/blimp/client/public/session/assignment.cc b/blimp/client/public/session/assignment.cc
new file mode 100644
index 0000000000000000000000000000000000000000..333875fb2e07f0f8259853e2508ba73c84472225
--- /dev/null
+++ b/blimp/client/public/session/assignment.cc
@@ -0,0 +1,30 @@
+// Copyright 2016 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 "blimp/client/public/session/assignment.h"
+
+#include "net/cert/x509_certificate.h"
+
+namespace blimp {
+namespace client {
+
+Assignment::Assignment() : transport_protocol(TransportProtocol::UNKNOWN) {}
+
+Assignment::Assignment(const Assignment& other) = default;
+
+Assignment::~Assignment() {}
+
+bool Assignment::IsValid() const {
+  if (engine_endpoint.address().empty() || engine_endpoint.port() == 0 ||
+      transport_protocol == TransportProtocol::UNKNOWN) {
+    return false;
+  }
+  if (transport_protocol == TransportProtocol::SSL && !cert) {
+    return false;
+  }
+  return true;
+}
+
+}  // namespace client
+}  // namespace blimp