@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getStartTime());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getLastUpdateTime());
    }
    if (java.lang.Double.doubleToRawLongBits(progressPercentage_) != 0) {
      size += com.google.protobuf.CodedOutputStream.computeDoubleSize(3, progressPercentage_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
The progress of the most recent processing update in percentage, ie. 70.0%.
</pre>

<code>double progress_percentage = 3;</code>

@return The progressPercentage.
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesizeLongAudioMetadata.java