Adding default trybot names to PRESUBMIT.py. With this change, only the listed trybots will be the ones that a tryjob is sent to. This works because there's a check in depot_tools/presubmit_support.py that looks for a function defined with the name 'GetPreferredTrySlaves'.
Adding default trybot names to PRESUBMIT.py.
With this change, only the listed trybots will be the ones that a tryjob
is sent to. This works because there's a check in depot_tools/presubmit_support.py that looks for a function defined with the name 'GetPreferredTrySlaves'.

This makes it possible for us to add new trybots that will not receive jobs by default (only when the --bot flag is specified).

This CL is needed before we add the following try bots:
linux_memcheck
linux_tsan
linux_asan

BUG=none
TEST=submitting jobs to a local try server, with and without the --bot
flag.

Review URL: https://webrtc-codereview.appspot.com/939008

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@3031 4adac7df-926f-26a2-2b94-8c16560cd09d

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