public com.google.devtools.cloudtrace.v2.StackTrace.StackFrames.Builder
        getStackFramesBuilder() {
      bitField0_ |= 0x00000001;
      onChanged();
      return getStackFramesFieldBuilder().getBuilder();
    }
<pre>
Stack frames in this stack trace. A maximum of 128 frames are allowed.
</pre>

<code>.google.devtools.cloudtrace.v2.StackTrace.StackFrames stack_frames = 1;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/StackTrace.java