bot_update: add --auth-refresh-token-json passthrough for apply_issue

recipe_modules/bot_update/example.py

Index: recipe_modules/bot_update/example.py
diff --git a/recipe_modules/bot_update/example.py b/recipe_modules/bot_update/example.py
index 24bc89b9084d54c0a76a07d6088c02c3ec9e5096..f0b14470b911f2058a1c011687f6374bdc65d23c 100644
--- a/recipe_modules/bot_update/example.py
+++ b/recipe_modules/bot_update/example.py
@@ -31,6 +31,7 @@ def RunSteps(api):
   with_branch_heads = api.properties.get('with_branch_heads', False)
   refs = api.properties.get('refs', [])
   oauth2 = api.properties.get('oauth2', False)
+  oauth2_json = api.properties.get('oauth2_json', None)
   root_solution_revision = api.properties.get('root_solution_revision')
   suffix = api.properties.get('suffix')
   gerrit_no_reset = True if api.properties.get('gerrit_no_reset') else False
@@ -50,6 +51,7 @@ def RunSteps(api):
         with_branch_heads=with_branch_heads,
         output_manifest=output_manifest,
         refs=refs, patch_oauth2=oauth2,
+        oauth2_json=oauth2_json,
         clobber=clobber,
         root_solution_revision=root_solution_revision,
         suffix=suffix,
@@ -98,6 +100,12 @@ def GenTests(api):
       slavename='totallyaslave-c4',
       oauth2=True,
   )
+  yield api.test('trychange_oauth2_json') + api.properties(
+      mastername='tryserver.chromium.linux',
+      buildername='linux_rel',
+      slavename='totallyaslave-c4',
+      oauth2_json='/creds/something',
+  )
   yield api.test('tryjob_fail') + api.properties(
       mastername='tryserver.chromium.linux',
       buildername='linux_rel',