enhance ttml rendering

Author: valotvince

AUTHORS

@@ -51,3 +51,4 @@ Tomas Tichy <mr.tichyt@gmail.com>
 Toshihiro Suzuki <t.suzuki326@gmail.com>
 uStudio Inc. <*@ustudio.com>
 Verizon Digital Media Services <*@verizondigitalmedia.com>
+Vincent Valot <valot.vince@gmail.com>

CONTRIBUTORS

@@ -83,4 +83,5 @@ Torbjörn Einarsson <torbjorn.einarsson@edgeware.tv>
 Toshihiro Suzuki <t.suzuki326@gmail.com>
 Vasanth Polipelli <vasanthap@google.com>
 Vignesh Venkatasubramanian <vigneshv@google.com>
+Vincent Valot <valot.vince@gmail.com>
 Yohann Connell <robinconnell@google.com>

externs/shaka/text.js

@@ -316,6 +316,20 @@ shaka.extern.Cue = class {
      * @exportDoc
      */
     this.id;
+
+    /**
+     * Nested cues
+     * @type {Array.<!shaka.extern.Cue>}
+     * @exportDoc
+     */
+    this.nestedCues;
+
+    /**
+     * Whether or not the cue only acts as a spacer between two cues
+     * @type {boolean}
+     * @exportDoc
+     */
+    this.spacer;
   }
 };
 

lib/text/cue.js

@@ -182,6 +182,18 @@ shaka.text.Cue = class {
      * @exportInterface
      */
     this.id = '';
+
+    /**
+     * @override
+     * @exportInterface
+     */
+    this.nestedCues = [];
+
+    /**
+     * @override
+     * @exportInterface
+     */
+    this.spacer = false;
   }
 };