rr record hangs on DCHECK failures on Chromium's blink_unittests

Chromium has a binary blink_unittests that runs a number of tests for Blink with gtest, and rr record hangs whenever it hits an assertion failure (with DCHECK). The log showing the cause of the assertion failure is printed, but the hang seems to happen before the stack trace can be printed.

To reproduce, try adding a dummy test to some of the unit test files under third_party/blink. For example, with third_party/blink/renderer/core/layout/layout_table_test.cc, add the following:

TEST_F(LayoutTableTest, DummyTestForRr) {
  DCHECK(false);
}

Then compile with autoninja -C out/Default blink_tests and record with rr record ./out/Default/blink_unittests --gtest_filter="LayoutTableTest.DummyTestForRr".