Add media router common classes and unittests.

chrome/browser/media/router/media_source_unittest.cc

Index: chrome/browser/media/router/media_source_unittest.cc
diff --git a/chrome/browser/media/router/media_source_unittest.cc b/chrome/browser/media/router/media_source_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ccf08fe6cfee82dba2c419af34135ebe9802aa5b
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+++ b/chrome/browser/media/router/media_source_unittest.cc
@@ -0,0 +1,25 @@
+// 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_source.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media_router {
+
+class MediaSourceTest : public ::testing::Test {
+ public:
+  MediaSourceTest() {}
+  ~MediaSourceTest() override {}
+};
+
+TEST_F(MediaSourceTest, IsMirroringMediaSource) {
+  EXPECT_TRUE(IsMirroringMediaSource(ForTabMediaSource(123)));
+  EXPECT_TRUE(IsMirroringMediaSource(ForDesktopMediaSource()));
+  EXPECT_FALSE(IsMirroringMediaSource(ForDialAppMediaSource("DialApp")));
+  EXPECT_FALSE(IsMirroringMediaSource(ForCastAppMediaSource("CastApp")));
+  EXPECT_FALSE(IsMirroringMediaSource(ForPresentationUrl("http://url")));
+}
+
+}  // namespace media_router
+