Roll src/third_party/catapult/ 82d4df2ea..863250f04 (3 commits).

https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git/+log/82d4df2ea564..863250f040be

$ git log 82d4df2ea..863250f04 --date=short --no-merges --format='%ad %ae %s'
2016-09-15 nednguyen Fix typo in TimelineBasedMeasurement's comments
2016-09-15 benjhayden Document how to write metrics.
2016-09-15 benjhayden Display zero values in value-set-table

TBR=catapult-sheriff@chromium.org

Review-Url: https://codereview.chromium.org/2341213002
Cr-Commit-Position: refs/heads/master@{#419093}

DEPS

@@ -92,7 +92,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.
-  'catapult_revision': '82d4df2ea564e564534404d1abb277a0e186e4c6',
+  'catapult_revision': '863250f040be745de1b273a53c430c1a0d18ea8b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.