feat(ads): Add getPodIndex to CS and SS ads (#5524)

Closes #5431

Author: avelad

externs/ima.js

@@ -204,6 +204,9 @@ google.ima.AdPodInfo = class {
 
   /** @return {number} */
   getTimeOffset() {}
+
+  /** @return {number} */
+  getPodIndex() {}
 };
 
 /** @const */
@@ -447,6 +450,9 @@ google.ima.dai.api.AdPodInfo = class {
 
   /** @return {number} */
   getTimeOffset() {}
+
+  /** @return {number} */
+  getPodIndex() {}
 };
 
 

externs/shaka/ads.js

@@ -286,4 +286,9 @@ shaka.extern.IAd = class {
    * @return {number}
    */
   getTimeOffset() {}
+
+  /**
+   * @return {number}
+   */
+  getPodIndex() {}
 };

lib/ads/client_side_ad.js

@@ -323,6 +323,21 @@ shaka.ads.ClientSideAd = class {
     return podInfo.getTimeOffset();
   }
 
+  /**
+   * @override
+   * @export
+   */
+  getPodIndex() {
+    const podInfo = this.ad_.getAdPodInfo();
+    if (podInfo == null) {
+      // Defaults to 0 if this ad is not part of a pod, or the pod is not part
+      // of an ad playlist.
+      return 0;
+    }
+
+    return podInfo.getPodIndex();
+  }
+
   /**
    * @override
    * @export

lib/ads/server_side_ad.js

@@ -292,6 +292,21 @@ shaka.ads.ServerSideAd = class {
     return podInfo.getTimeOffset();
   }
 
+  /**
+   * @override
+   * @export
+   */
+  getPodIndex() {
+    const podInfo = this.ad_.getAdPodInfo();
+    if (podInfo == null) {
+      // Defaults to 0 if this ad is not part of a pod, or the pod is not part
+      // of an ad playlist.
+      return 0;
+    }
+
+    return podInfo.getPodIndex();
+  }
+
   /**
    * @override
    * @export

lib/text/simple_text_displayer.js

@@ -51,6 +51,7 @@ shaka.text.SimpleTextDisplayer = class {
       // kinds which can be displayed in the app's UI.
       this.textTrack_ = video.addTextTrack(
           'subtitles', shaka.Player.TextTrackLabel);
+      console.log(this.textTrack_);
     }
     this.textTrack_.mode = 'hidden';
   }

test/test/util/fake_ad.js

@@ -64,6 +64,9 @@ shaka.test.FakeAd = class {
 
     /** @private {number} */
     this.timeOffsetInPod_ = 1;
+
+    /** @private {number} */
+    this.podIndex_ = 1;
   }
 
   /**
@@ -300,6 +303,14 @@ shaka.test.FakeAd = class {
     return this.timeOffsetInPod_;
   }
 
+  /**
+   * @override
+   * @export
+   */
+  getPodIndex() {
+    return this.podIndex_;
+  }
+
   /**
    * @override
    * @export