fix(LCEVC): Create segmentIndex on makeAbortDecision_

lib/media/streaming_engine.js

@@ -813,6 +813,11 @@ shaka.media.StreamingEngine = class {
       await originalStream.createSegmentIndex();
     }
 
+    const dependencyStream = originalStream.dependencyStream;
+    if (dependencyStream && !dependencyStream.segmentIndex) {
+      await dependencyStream.createSegmentIndex();
+    }
+
     if (mediaState.operation != originalOperation) {
       // The original operation completed while we were getting a segment index,
       // so there's nothing to do now.
@@ -1377,6 +1382,18 @@ shaka.media.StreamingEngine = class {
       }
     }
 
+    // If the stream has a dependency, make sure its segment index exists.
+    if (mediaState.dependencyMediaState) {
+      if (!mediaState.dependencyMediaState.stream.segmentIndex) {
+        try {
+          await mediaState.dependencyMediaState.stream.createSegmentIndex();
+        } catch (error) {
+          shaka.log.warning(
+              'Could not create segment index for dependency', error);
+        }
+      }
+    }
+
     // Update the MediaState.
     try {
       const delay = this.update_(mediaState);