code: @Implementation(minSdk = JELLY_BEAN_MR2)
    protected static void beginSection(String sectionName) {
      if (Trace.isTagEnabled(TRACE_TAG_APP)) {
        if (crashOnIncorrectUsage) {
          if (sectionName.length() > MAX_SECTION_NAME_LEN) {
            throw new IllegalArgumentException("sectionName is too long");
          }
        } else if (sectionName == null) {
          Log.w(TAG, "Section name cannot be null");
          return;
        } else if (sectionName.length() > MAX_SECTION_NAME_LEN) {
          Log.w(TAG, "Section name is too long");
          return;
        }
  
        synchronized (lock) {
          currentSections.addFirst(sectionName);
        }
      }
    }
docs: Starts a new trace section with given name.