Enable --git-cache-dir option in chromite/cbuildbot.

scripts/slave/recipes/cros/cbuildbot_tryjob.py

Index: scripts/slave/recipes/cros/cbuildbot_tryjob.py
diff --git a/scripts/slave/recipes/cros/cbuildbot_tryjob.py b/scripts/slave/recipes/cros/cbuildbot_tryjob.py
index 39f16a68435807e7d335b325b6f021123bc77bbd..ed40292ce7ea9ddc18eb2bdcc451e8337cd86b39 100644
--- a/scripts/slave/recipes/cros/cbuildbot_tryjob.py
+++ b/scripts/slave/recipes/cros/cbuildbot_tryjob.py
@@ -146,6 +146,38 @@ def GenTests(api):
       + api.chromite.seed_chromite_config(_CHROMITE_CONFIG)
   )
 
+  yield (
+      api.test('release')
+      + api.properties(
+          mastername='chromiumos.tryserver',
+          buildername='paladin',
+          slavename='test',
+          repository='https://chromium.googlesource.com/chromiumos/tryjobs.git',
+          revision=api.gitiles.make_hash('test'),
+          cbb_config='x86-generic-full',
+          cbb_branch='release-R55-9999.B',
+          cbb_extra_args='["--timeout", "14400", "--remote-trybot",'
+                         '"--remote-version=4"]',
+      )
+      + api.chromite.seed_chromite_config(_CHROMITE_CONFIG)
+  )
+
+  yield (
+      api.test('pre_git_cache_release')
+      + api.properties(
+          mastername='chromiumos.tryserver',
+          buildername='paladin',
+          slavename='test',
+          repository='https://chromium.googlesource.com/chromiumos/tryjobs.git',
+          revision=api.gitiles.make_hash('test'),
+          cbb_config='x86-generic-full',
+          cbb_branch='release-R54-8743.B',
+          cbb_extra_args='["--timeout", "14400", "--remote-trybot",'
+                         '"--remote-version=4"]',
+      )
+      + api.chromite.seed_chromite_config(_CHROMITE_CONFIG)
+  )
+
   # Test a CrOS tryjob with compressed "cbb_extra_args".
   yield (
       api.test('basic_compressed')
@@ -189,8 +221,6 @@ def GenTests(api):
           repository='https://chromium.googlesource.com/chromiumos/tryjobs.git',
           revision=api.gitiles.make_hash('test'),
           cbb_config='binhost-pre-cq',
-          cbb_extra_args='["--timeout", "14400", "--remote-trybot",'

[nxia1, 2016/09/23 20:37:41]

why are we removing this cbb_extra_args test? 

[dnj, 2016/09/23 21:15:18]

Do we actually use this for BuildBucket still? I thought we were loading params
straight from BuildBucket param dict. Either way you're right, doesn't belong in
this CL.

-                         '"--remote-version=4"]',
           buildbucket=json.dumps({'build': {'id':'12345'}})
       )
       + api.chromite.seed_chromite_config(_CHROMITE_CONFIG)