feat(DASH): Add MPD Patch support

externs/shaka/player.js

@@ -842,6 +842,7 @@ shaka.extern.InitDataTransform;
  *   keySystemsByURI: !Object.<string, string>,
  *   manifestPreprocessor: function(!Element),
  *   sequenceMode: boolean,
+ *   enablePatchMPDSupport: boolean,
  *   enableAudioGroups: boolean
  * }}
  *
@@ -900,6 +901,10 @@ shaka.extern.InitDataTransform;
  *   If true, the media segments are appended to the SourceBuffer in
  *   "sequence mode" (ignoring their internal timestamps).
  *   <i>Defaults to <code>false</code>.</i>
+ * @property {boolean} enablePatchMPDSupport
+ *   Enables DASH Patch manifest support.
+ *   This feature is experimental.
+ *   This value defaults to <code>false</code>.
  * @property {boolean} enableAudioGroups
  *   If set, audio streams will be grouped and filtered by their parent
  *   adaptation set ID.