All of the try-bots for PDFium have gone purple with failed bot_updates [1]

Traceback (most recent call last):
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py", line 2295, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py", line 2281, in main
    return dispatcher.execute(OptionParser(), argv)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/subcommand.py", line 252, in execute
    return command(parser, args[1:])
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py", line 2030, in CMDsync
    ret = client.RunOnDeps('update', args)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py", line 1340, in RunOnDeps
    work_queue.flush(revision_overrides, command, args, options=self._options)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient_utils.py", line 1047, in run
    self.item.run(*self.args, **self.kwargs)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py", line 766, in run
    self.ParseDepsFile()
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py", line 562, in ParseDepsFile
    gclient_eval.Check(deps_content, filepath, global_scope, local_scope)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient_eval.py", line 236, in Check
    result_scope = _gclient_exec(content, global_scope, filename=path)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient_eval.py", line 181, in _gclient_exec
    _visit_in_module(stmt)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/gclient_eval.py", line 177, in _visit_in_module
    getattr(node, 'lineno', '<unknown>')))
ValueError: unexpected AST node: <_ast.Import object at 0x7f6c2ea203d0> Import(names=[alias(name='os', asname=None)]) (file '/b/build/slave/linux_xfa/build/pdfium/third_party/skia/DEPS', line 50)
===Failed in 0.1 mins===

Traceback (most recent call last):
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 1141, in <module>
    sys.exit(main())
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 1125, in main
    checkout(options, git_slns, specs, revisions, step_text, shallow)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 1045, in checkout
    gclient_output = ensure_checkout(**checkout_parameters)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 805, in ensure_checkout
    break_repo_locks)
  File "/b/build/scripts/slave/.recipe_deps/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 356, in gclient_sync
    raise GclientSyncFailed(e.message, e.code, e.output)
__main__.GclientSyncFailed: /usr/bin/python -u /b/build/scripts/slave/.recipe_deps/depot_tools/gclient.py sync --verbose --reset --force --ignore_locks --output-json /tmp/tmpFW7mT5.json --nohooks --noprehooks --delete_unversioned_trees --revision pdfium@unmanaged failed with code 1 in /b/build/slave/linux_xfa/build.
step returned non-zero exit code: 1


1- https://build.chromium.org/p/tryserver.client.pdfium/builders/linux_xfa/builds/5157/steps/bot_update/logs/stdio