Add media router common classes and unittests.

chrome/browser/media/router/media_route_unittest.cc

+// Copyright 2015 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_route.h"
+#include "chrome/browser/media/router/media_sink.h"
+#include "chrome/browser/media/router/media_source_helper.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace media_router {
+
+// Tests the == operator to ensure that only route ID equality is being checked.

[mark a. foltz, 2015/03/10 20:59:37]

Right now, you're testing Equals().

+TEST(MediaRouteTest, Equals) {
+  MediaRoute route1("routeId1", ForCastAppMediaSource("DialApp"),
+                    MediaSink("sinkId", "sinkName"),
+                    "Description", false);
+
+  // Same as route1 with different sink ID.
+  MediaRoute route2("routeId1", ForCastAppMediaSource("DialApp"),
+                    MediaSink("differentSinkId", "different sink"),
+                    "Description", false);
+  EXPECT_TRUE(route1.Equals(route2));
+
+  // Same as route1 with different description.
+  MediaRoute route3("routeId1", ForCastAppMediaSource("DialApp"),
+                    MediaSink("sinkId", "sinkName"),
+                    "differentDescription", false);
+  EXPECT_TRUE(route1.Equals(route3));
+
+  // Same as route1 with different is_local.
+  MediaRoute route4("routeId1", ForCastAppMediaSource("DialApp"),
+                    MediaSink("sinkId", "sinkName"),
+                    "Description", true);
+  EXPECT_TRUE(route1.Equals(route4));
+
+  // The ID is different from route1's.
+  MediaRoute route5("routeId2", ForCastAppMediaSource("DialApp"),
+                    MediaSink("sinkId", "sinkName"),
+                    "Description", false);
+  EXPECT_FALSE(route1.Equals(route5));
+}
+
+}  // namespace media_router