Roll src/third_party/catapult/ 9a5b75ed3..256098db1 (4 commits)

https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git/+log/9a5b75ed3609..256098db1e09

$ git log 9a5b75ed3..256098db1 --date=short --no-merges --format='%ad %ae %s'
2017-07-07 benjhayden Reland Fix _GetSelectedTestPathsForDict in /list_tests handler.
2017-07-07 erikchen Use json.dumps instead of json.dump in symbolize_trace.py.
2017-07-07 benjhayden Clean up MERGED_FROM in histogram.py.
2017-07-07 mikecase Decrease iter_timeout for logcat_monitor by factor of 10.

Created with:
  roll-dep src/third_party/catapult
BUG=740263


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=sullivan@chromium.org

Change-Id: I2137321803b52e544fd47074a13225e63faf5e7b
Reviewed-on: https://chromium-review.googlesource.com/564066
Reviewed-by: <catapult-deps-roller@chromium.org>
Commit-Queue: <catapult-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485120}

DEPS

@@ -96,7 +96,7 @@ 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': '9a5b75ed36094a64167f3fdec2f8a64b49985018',
+  'catapult_revision': '256098db1e096b3ac7b97a29486a1ea6bfb74fe6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.