mBeginLoadTime = PR_IntervalToMicroseconds(PR_IntervalNow());
HTMLContentSink::WillBuildModel(void){  if (mFlags & NS_SINK_FLAG_CAN_INTERRUPT_PARSER) {    nsresult rv = AddDummyParserRequest();    NS_ASSERTION(NS_SUCCEEDED(rv), "Adding dummy parser request failed");    if (NS_FAILED(rv)) {      // Don't return the error result, just reset flag which indicates that it can      // interrupt parsing. If AddDummyParserRequests fails it should not affect      // WillBuildModel.      mFlags &= ~NS_SINK_FLAG_CAN_INTERRUPT_PARSER;    }  }  // Notify document that the load is beginning  mDocument->BeginLoad();  return NS_OK;}