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 {

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

Please take a look at media_sources.h.

+
+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"));

[xhwang, 2015/03/05 22:28:50]

Does this has to be a hex string? What anout XYZ?

[Kevin M, 2015/03/06 23:12:45]

Yes it does.

[xhwang, 2015/03/09 17:37:30]

Add a test case for XYZ then?

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

Protocol-specific ID syntax validation takes place within the JS module running
inside the extension, which is outside the scope of this component. The MR here
is meant to be agnostic to protocol level details.

+  EXPECT_EQ("http://theoatmeal.com/",
+            ForPresentationUrl("http://theoatmeal.com/"));
+}
+
+TEST(MediaSourceTest, IsValidMediaSource) {
+  EXPECT_TRUE(IsValidMediaSource(ForTabMediaSource(123)));

[xhwang, 2015/03/05 22:28:50]

How about urn:x-org.chromium.media:source:tab:foo?

[Kevin M, 2015/03/06 23:12:45]

Done.

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

Sorry, didn't mean to mark this as done. 

This is another example of URN validation that should be performed at the
extension side.

+  EXPECT_TRUE(IsValidMediaSource(ForDesktopMediaSource()));
+  EXPECT_TRUE(IsValidMediaSource(ForCastAppMediaSource("DEADBEEF")));
+  EXPECT_TRUE(IsValidMediaSource(ForPresentationUrl("http://theoatmeal.com/")));

[xhwang, 2015/03/05 22:28:50]

Also test https?

[Kevin M, 2015/03/06 23:12:45]

Done.

+
+  // Disallowed scheme
+  EXPECT_FALSE(
+      IsValidMediaSource(ForPresentationUrl("file:///some/local/path")));
+  // Not a URL
+  EXPECT_FALSE(IsValidMediaSource(ForPresentationUrl("exploding kittens")));
+}
+
+}  // namespace media_router