[Cast, Android] The 2nd try to replace TransportXX classes in Cast UI

third_party/android_media/README.chromium

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+Name: MediaController Android sample.
+URL: https://android.googlesource.com/platform/development/+/b356564/samples/Support4Demos/src/com/example/android/supportv4/media/MediaController.java
+Version: 74c5bcff29959931c8a4b15e4afa613975a47f4c
+License: Apache 2.0
+Security Critical: no
+
+Description:
+This contains a modified copy of MediaController.java and the associated
+resources.
+
+MediaController.java is based on a public Android sample that was
+available as part of the Android support libraries installation (see
+https://developer.android.com/tools/support-library/index.html). It is
+also available from:
+https://android.googlesource.com/platform/development/+/b356564/samples/Support4Demos/src/com/example/android/supportv4/media/MediaController.java
+
+Local Modifications:
+- TransportController and TransportMediator are replaced with a custom
+  interface
+- minor bug fixes.