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 "testing/gmock/include/gmock/gmock.h"
+
+namespace media_router {
+
+class MediaRouteTest : public ::testing::Test {
+ protected:
+  MediaRouteTest() {}
+  ~MediaRouteTest() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaRouteTest);
+};
+
+
+// Tests the == operator.
+TEST_F(MediaRouteTest, Equals) {
+  MediaRoute route1("routeId1",
+      ForCastAppMediaSource("DialApp"), "sinkId", "Description", false);

[mark a. foltz, 2015/03/04 06:22:59]

Can we use ForPresentationUrl or ForTabId instead?
This would make it easier to remove this method down the line.

+
+  // Same as route1.
+  MediaRoute route2("routeId1",
+      ForCastAppMediaSource("DialApp"), "sinkId", "Description", false);
+  EXPECT_EQ(route1, route2);
+
+  // The ID is different from route1's.
+  MediaRoute route3("routeId2",
+      ForCastAppMediaSource("DialApp"), "sinkId", "Description", false);
+  EXPECT_NE(route1, route3);
+
+  // The MediaSource is different from route1's.
+  MediaRoute route4("routeId2",
+      ForDesktopMediaSource(), "sinkId", "Description", false);
+  EXPECT_NE(route1, route4);
+
+  // The sink ID is different from route1's.
+  MediaRoute route5("routeId2",
+      ForCastAppMediaSource("DialApp"), "anotherSinkId", "Description", false);
+  EXPECT_NE(route1, route5);
+}
+
+}  // namespace media_router