GitLab

Run iOS test runner unit tests as part of presubmit. Keeping scope to
functional tests, and will have separate CLs for the remaining files
that require further fixes.

* PRESUBMIT.py - include unit test execution for ios/build/bots/scripts
* run.py - unit tests caught logic incorrectness. Running the json
   parsing first, before validation.
* wpr_runner_test.py - remove install xcode mock, fixed broken tests
* test_apps_test.py and xcode_log_parser_test.py - include main call
   to unittest.

Bug: 1056457
Change-Id: Ifc233695ba8f6120f862586a497df61e96d4954f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076765Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746102}