commit 52a1d009a0a935bed3bbdaa83741e1eee083de32
author Eric Seckler <eseckler@chromium.org> Thu Jun 20 10:57:56 2019
committer Commit Bot <commit-bot@chromium.org> Thu Jun 20 10:57:56 2019
tree f4782d63d5c96b9597b99351654d6f69c0769e43
parent 129d63efe57dc1128c868ab8046fe4ac7499f6fa

devtools/tracing: Notify client about data loss during tracing

Telemetry would like to know if the trace is incomplete, e.g. due to
the trace ring buffer wrapping around, since this can result in
incorrect metrics computation.

This patch adds a param to the Tracing.tracingComplete devtools event,
which we set based off the buffer stats reported by perfetto. For that
purpose, we also plumb a corresponding boolean through the
TracingSession consumer mojo interface.

Bug: 948412
Change-Id: I327e117229893232170111659ed84f7e67debdf9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666633
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670848}