Add media router common classes and unittests.

chrome/browser/media/router/media_sink.cc

Index: chrome/browser/media/router/media_sink.cc
diff --git a/chrome/browser/media/router/media_sink.cc b/chrome/browser/media/router/media_sink.cc
new file mode 100644
index 0000000000000000000000000000000000000000..baad5ffebb889cca74d23d9a639e457e3e25beef
--- /dev/null
+++ b/chrome/browser/media/router/media_sink.cc
@@ -0,0 +1,55 @@
+// 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 "chrome/browser/media/router/media_sink.h"
+
+#include "base/logging.h"
+
+namespace media_router {
+
+MediaSink::MediaSink(const MediaSinkId& sink_id,
+                     const std::string& name,
+                     const MediaRouteId& route_id,
+                     Status status)
+    : sink_id_(sink_id), name_(name), route_id_(route_id), status_(status) {
+  if (status == Status::ACTIVE) {
+    DCHECK(!route_id_.empty()) << "Inactive sink cannot have route ID";
+  } else {
+    DCHECK(route_id_.empty()) << "Active sinks have must route ID";
+  }
+}
+
+MediaSink::~MediaSink() {
+}
+
+std::string MediaSink::StatusAsString() const {
+  switch (status_) {
+    case MediaSink::IDLE:
+      return "IDLE";
+    case MediaSink::ACTIVE:
+      return "ACTIVE";
+    case MediaSink::REQUEST_PENDING:
+      return "REQUEST_PENDING";
+    default:
+      NOTREACHED();
+      return "";
+  }
+}
+
+bool MediaSink::HasRoute() const {
+  return !route_id_.empty();
+}
+
+bool MediaSink::operator==(const MediaSink& other) const {
+  return sink_id_ == other.sink_id_ &&
+         name_ == other.name_ &&
+         status_ == other.status_ &&
+         route_id_ == other.route_id_;
+}
+
+bool MediaSink::operator!=(const MediaSink& other) const {
+  return !(*this == other);
+}
+
+}  // namespace media_router