Add media router common classes and unittests.

chrome/browser/media/router/media_source_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_source.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media_router {
+
+TEST(MediaSourceTest, IsMirroringMediaSource) {
+  EXPECT_TRUE(IsMirroringMediaSource(ForTabMediaSource(123)));
+  EXPECT_TRUE(IsMirroringMediaSource(ForDesktopMediaSource()));
+  EXPECT_FALSE(IsMirroringMediaSource(ForCastAppMediaSource("CastApp")));
+  EXPECT_FALSE(IsMirroringMediaSource(ForPresentationUrl("http://url")));
+}
+
+TEST(MediaSourceTest, CreateMediaSource) {
+  EXPECT_EQ("urn:x-org.chromium.media:source:tab:123",
+            ForTabMediaSource(123));
+  EXPECT_EQ("urn:x-org.chromium.media:source:desktop",
+            ForDesktopMediaSource());
+  EXPECT_EQ("urn:x-com.google.cast:application:DEADBEEF",
+            ForCastAppMediaSource("DEADBEEF"));
+  EXPECT_EQ("http://theoatmeal.com/",
+            ForPresentationUrl("http://theoatmeal.com/"));
+}
+
+TEST(MediaSourceTest, IsValidMediaSource) {
+  EXPECT_TRUE(IsValidMediaSource(ForTabMediaSource(123)));
+  EXPECT_TRUE(IsValidMediaSource(ForDesktopMediaSource()));
+  EXPECT_TRUE(IsValidMediaSource(ForCastAppMediaSource("DEADBEEF")));
+  EXPECT_TRUE(IsValidMediaSource(ForPresentationUrl("http://theoatmeal.com/")));
+
+  // Disallowed scheme
+  EXPECT_FALSE(
+      IsValidMediaSource(ForPresentationUrl("file:///some/local/path")));
+  // Not a URL
+  EXPECT_FALSE(IsValidMediaSource(ForPresentationUrl("exploding kittens")));
+}
+
+}  // namespace media_router