public Builder clearAdTracking() {
      bitField0_ = (bitField0_ & ~0x00000100);
      adTracking_ = 0;
      onChanged();
      return this;
    }
<pre>
Required. Determines how the ad should be tracked.
</pre>

<code>
.google.cloud.video.stitcher.v1.AdTracking ad_tracking = 11 [(.google.api.field_behavior) = REQUIRED];
</code>

@return This builder for chaining.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/VodSession.java