Call new CheckJsonParses in PRESUBMIT

I have verified that all JSON files currently in depot_tools
pass this check.

Change-Id: I8247653a8161adf69b20d0a837b9f7723936ade2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1620308
Reviewed-by: Sean McCullough <seanmccullough@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>

PRESUBMIT.py

@@ -61,6 +61,8 @@ def CommonChecks(input_api, output_api, tests_to_black_list):
   results.extend(input_api.canned_checks.CheckOwners(input_api, output_api))
   results.extend(input_api.canned_checks.CheckOwnersFormat(
       input_api, output_api))
+  results.extend(input_api.canned_checks.CheckJsonParses(
+      input_api, output_api))
 
   # Run only selected tests on Windows.
   tests_to_white_list = [r'.*test\.py$']