Enables early out on trybot linux_chromium_clang_dbg builder

I'm starting with this one to make sure everything works ok.

BUG=383609
TEST=none
TBR=iannucci@chromium.org

Review URL: https://codereview.chromium.org/385483003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284116 0039d316-1c4b-4281-b951-d872f2087c98

testing/buildbot/chromium_trybot.json

@@ -190,5 +190,6 @@
   ],
 
   "filter_builders": [
+    "linux_chromium_clang_dbg"
   ]
 }