Add media router common classes and unittests.

chrome/browser/media/router/media_source.cc

Index: chrome/browser/media/router/media_source.cc
diff --git a/chrome/browser/media/router/media_source.cc b/chrome/browser/media/router/media_source.cc
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+// Copyright 2014 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"

[mark a. foltz, 2015/02/27 05:48:10]

This file doesn't look current.

[Kevin M, 2015/02/27 18:42:17]

Fetched the latest changes and pulled them in and made sure all the other files
are current too.

Also updated the Chromium copyright. :)

+
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+
+namespace media_router {
+
+namespace {
+const char* kTabMediaSourcePrefix = "urn:google:tab:";
+const char* kDesktopMediaSource = "urn:google:desktop";
+
+}  // namespace
+
+MediaSource ForTabMediaSource(int tab_id) {
+  return base::StringPrintf("%s%d", kTabMediaSourcePrefix, tab_id);
+}
+
+MediaSource ForDesktopMediaSource() {
+  return kDesktopMediaSource;
+}
+
+MediaSource ForDialAppMediaSource(const std::string& app_name) {
+  return "urn:google:dial:" + app_name;
+}
+
+MediaSource ForCastAppMediaSource(const std::string& app_name) {
+  return "urn:google:cast:" + app_name;
+}
+
+MediaSource ForPresentationUrl(const std::string& presentation_url) {
+  // TODO(imcheng): Figure out correct scheme for presentation urls.
+  return "urn:google:presentation:" + presentation_url;
+}
+
+bool IsMirroringMediaSource(const MediaSource& source) {
+  return StartsWithASCII(source, kTabMediaSourcePrefix, true) ||
+         StartsWithASCII(source, kDesktopMediaSource, true);
+}
+
+}  // namespace media_router