This CL implements the Reactive configuration, a configuration that allows triggering a trace manually,
and the trace is either concluded after a timeout or on
a second trigger.

BUG=495187

Review URL: https://codereview.chromium.org/1148393003

Cr-Commit-Position: refs/heads/master@{#332739}
7 files changed