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(MediaSource::ForTab(123).SupportsMirroring());
+  EXPECT_TRUE(MediaSource::ForDesktop().SupportsMirroring());
+  EXPECT_FALSE(MediaSource::ForCastApp("CastApp").SupportsMirroring());
+  EXPECT_FALSE(
+      MediaSource::ForPresentationUrl("http://url").SupportsMirroring());
+}
+
+TEST(MediaSourceTest, CreateMediaSource) {
+  EXPECT_EQ("urn:x-org.chromium.media:source:tab:123",
+            MediaSource::ForTab(123).id());
+  EXPECT_EQ("urn:x-org.chromium.media:source:desktop",
+            MediaSource::ForDesktop().id());
+  EXPECT_EQ("urn:x-com.google.cast:application:DEADBEEF",
+            MediaSource::ForCastApp("DEADBEEF").id());
+  EXPECT_EQ("http://theoatmeal.com/",
+            MediaSource::ForPresentationUrl("http://theoatmeal.com/").id());
+}
+
+TEST(MediaSourceTest, SourceParse) {
+  MediaSource source;
+  EXPECT_TRUE(
+      source.Parse("urn:x-org.chromium.media:source:tab888"));
+  EXPECT_TRUE(source.Parse(MediaSource::ForDesktop().id()));
+  EXPECT_TRUE(source.Parse(MediaSource::ForCastApp("DEADBEEF").id()));
+  EXPECT_TRUE(source.Parse(
+      MediaSource::ForPresentationUrl("http://theoatmeal.com/").id()));

[xhwang, 2015/03/09 17:37:31]

hmm, http://theoatmeal.com is actually a real site... not sure whether we should
use a real one in test code...

[Kevin M, 2015/03/09 23:32:06]

Good point, but test code is removed anyway.

+  EXPECT_TRUE(source.Parse(MediaSource::ForPresentationUrl(
+                               "https://secure.theoatmeal.com/login").id()));
+
+  // Disallowed scheme
+  EXPECT_FALSE(source.Parse(
+      MediaSource::ForPresentationUrl("file:///some/local/path").id()));
+
+  // Not a URL
+  EXPECT_FALSE(source.Parse(
+      MediaSource::ForPresentationUrl("exploding kittens").id()));
+}
+
+}  // namespace media_router