Tracing: Connect to service on startup

Temporary workaround for flaky tests introduced by
https://chromium-review.googlesource.com/c/chromium/src/+/1439082

TBR=eseckler@chromium.org

Bug: 928410, 928363
Change-Id: I0dcf20cbdf91a7beea167a220ba9ef7e0604c1ab
Reviewed-on: https://chromium-review.googlesource.com/c/1452767
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631052}
bool TracingControllerImpl::IsTracing() const {
  return trace_config_ != nullptr;
}

bool TracingControllerImpl::IsTracing() const {
  return trace_config_ != nullptr;
}
