[chromedriver] Use percentFull instead of value in Tracing.bufferUsage.

[chromedriver] Use percentFull instead of value in Tracing.bufferUsage.

BUG=701995
Review-Url: https://codereview.chromium.org/2753763005
Cr-Commit-Position: refs/heads/master@{#457463}
Committed: https://chromium.googlesource.com/chromium/src/+/22bef933a34b9938f90d834759e49a8e9dd2ad05

[samuong, 2017-03-16 03:35:32]

samuong@chromium.org changed reviewers:
+ caseq@chromium.org

[caseq, 2017-03-16 16:48:40]

lgtm

[samuong, 2017-03-16 16:56:08]

The CQ bit was checked by samuong@chromium.org

[commit-bot: I haz the power, 2017-03-16 16:56:55]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-16 17:10:35]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489683368250860, "parent_rev":
"992fa8feb97734b7f1facce0cd5feffbb98d15f6", "commit_rev":
"22bef933a34b9938f90d834759e49a8e9dd2ad05"}

[commit-bot: I haz the power, 2017-03-16 17:11:14]

Description was changed from

==========
[chromedriver] Use percentFull instead of value in Tracing.bufferUsage.

BUG=701995
==========

to

==========
[chromedriver] Use percentFull instead of value in Tracing.bufferUsage.

BUG=701995

Review-Url: https://codereview.chromium.org/2753763005
Cr-Commit-Position: refs/heads/master@{#457463}
Committed:
https://chromium.googlesource.com/chromium/src/+/22bef933a34b9938f90d834759e4...
==========

[commit-bot: I haz the power, 2017-03-16 17:11:15]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/22bef933a34b9938f90d834759e4...