t runtimeTime = tr.b.Unit.timestampFromUs(
                v8RuntimeObject[runtimeCall][1] * timeIntersectionRatio);
            breakdownTree.v8_runtime.total += runtimeTime;
            breakdownTree.v8_runtime.events[runtimeCall] += runtimeTime;
          }
        }
      }
    }
    return breakdownTree;
  }

  /**
   * Adds 'blocked_on_network' and 'idle' to the |breakdownTree| that has been
   * generated by |generateTimeBreakdownTree|. Taking into account the
   * |networkEvents|, this function is a