private void ensurePagesIsMutable() {
      if (!pages_.isModifiable()) {
        pages_ = makeMutableCopy(pages_);
      }
      bitField0_ |= 0x00000008;
    }
<pre>
Additional context that may accompany the image(s) in the file.
</pre>

<code>.google.cloud.vision.v1p4beta1.ImageContext image_context = 3;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/AnnotateFileRequest.java