Add buildbot scripts for GN builders and dartdevc testers

Add buildbot scripts for GN builders and dartdevc testers

BUG=https://github.com/dart-lang/sdk/issues/27406
R=rnystrom@google.com, zra@google.com

Committed: https://github.com/dart-lang/sdk/commit/41b82b99e66cffadd9da07bb291a1373d22faf52

[Bill Hesse, 2016-10-11 15:33:54]

whesse@google.com changed reviewers:
+ rnystrom@google.com, zra@google.com

[Bill Hesse, 2016-10-11 15:33:54]

These scripts are called by the new recipes for ddc and sdk-gn builders.  Once
we implement and debug the right commands in these files, we can move them into
steps in the recipes.

[zra, 2016-10-11 15:45:53]

On 2016/10/11 15:33:54, Bill Hesse wrote:
> These scripts are called by the new recipes for ddc and sdk-gn builders.  Once
> we implement and debug the right commands in these files, we can move them
into
> steps in the recipes.

How do you want to proceed? Do you want to land this as-is and have Bob and I
fill in the commands in subsequent CLs?

[Bill Hesse, 2016-10-11 15:50:27]

On 2016/10/11 15:45:53, zra wrote:
> On 2016/10/11 15:33:54, Bill Hesse wrote:
> > These scripts are called by the new recipes for ddc and sdk-gn builders. 
Once
> > we implement and debug the right commands in these files, we can move them
> into
> > steps in the recipes.
> 
> How do you want to proceed? Do you want to land this as-is and have Bob and I
> fill in the commands in subsequent CLs?

Yes, exactly.  And I can help, as well.  The gn_build.py script gets a checkout
where gclient hooks have been run, but no build.  You may want to set
environment variables and run gclient hooks again.  The gn_tests script runs
after the gn_build script, if the first one succeeds.

And the ddc_tests scripts runs after tools/build.py -mrelease runtime create_sdk
has run.  We will eventually want to switch to downloading the sdk into
out/ReleaseX64/dart-sdk, instead of running build.py, though.

[zra, 2016-10-11 16:03:09]

On 2016/10/11 15:50:27, Bill Hesse wrote:
> Yes, exactly.  And I can help, as well.  The gn_build.py script gets a
checkout
> where gclient hooks have been run, but no build.  You may want to set
> environment variables and run gclient hooks again.  The gn_tests script runs
> after the gn_build script, if the first one succeeds.

Okay. Sounds good. Can I trust that gclient will be on the PATH or do I have to
go looking for it?

lgtm.

[Bob Nystrom, 2016-10-11 18:19:20]

The bots are a mystery to me, so I don't really know what I'm looking at but...
LGTM?

[Bill Hesse, 2016-10-12 12:31:48]

Description was changed from

==========
Add buildbot scripts for GN builders and dartdevc testers

BUG=https://github.com/dart-lang/sdk/issues/27406
==========

to

==========
Add buildbot scripts for GN builders and dartdevc testers

BUG=https://github.com/dart-lang/sdk/issues/27406
R=rnystrom@google.com, zra@google.com

Committed:
https://github.com/dart-lang/sdk/commit/41b82b99e66cffadd9da07bb291a1373d22faf52
==========

[Bill Hesse, 2016-10-12 12:31:50]

Committed patchset #1 (id:1) manually as
41b82b99e66cffadd9da07bb291a1373d22faf52 (presubmit successful).