Attach timestamp to ExoPlaybackException

PiperOrigin-RevId: 251748542

library/core/src/main/java/com/google/android/exoplayer2/ExoPlaybackException.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2;
 
+import android.os.SystemClock;
 import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.source.MediaSource;
@@ -73,6 +74,9 @@ public final class ExoPlaybackException extends Exception {
    */
   public final int rendererIndex;
 
+  /** The value of {@link SystemClock#elapsedRealtime()} when this exception was created. */
+  public final long timestampMs;
+
   @Nullable private final Throwable cause;
 
   /**
@@ -131,6 +135,7 @@ public final class ExoPlaybackException extends Exception {
     this.type = type;
     this.cause = cause;
     this.rendererIndex = rendererIndex;
+    timestampMs = SystemClock.elapsedRealtime();
   }
 
   private ExoPlaybackException(@Type int type, String message) {
@@ -138,6 +143,7 @@ public final class ExoPlaybackException extends Exception {
     this.type = type;
     rendererIndex = C.INDEX_UNSET;
     cause = null;
+    timestampMs = SystemClock.elapsedRealtime();
   }
 
   /**