Make build_shaderc.py blow away output dir and allow build_type arg to contain either Debug or Relea

Make build_shaderc.py blow away output dir and allow build_type arg to contain either Debug or Release

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1884963002

Committed: https://skia.googlesource.com/skia/+/09e127bd38d4f972134afca77184b217a9708b3a

[bsalomon, 2016-04-13 13:13:23]

Description was changed from

==========
Build shaderc in release mode iff CONFIGURATION_NAME contains Release
==========

to

==========
Build shaderc in release mode iff CONFIGURATION_NAME contains Release
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[bsalomon, 2016-04-13 14:28:23]

Description was changed from

==========
Build shaderc in release mode iff CONFIGURATION_NAME contains Release
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Make build_shaderc.py blow away output dir and allow build_type arg to contain
either Debug or Release

GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[bsalomon, 2016-04-13 14:34:07]

bsalomon@google.com changed reviewers:
+ borenet@google.com, egdaniel@google.com

[bsalomon, 2016-04-13 14:34:08]

I couldn't figure out how to make the logic in shaderc.gyp handle
CONFIGURATION_NAME variations. Using '"Release" in CONFIGURATION_NAME' in a gyp
conditional didn't work. So I made the script look for either Debug or Release
in the passed in build_type arg.

Also, it seemed locally that I had to have my shaderc output dir blown away to
have new cmake params respected. Since the script only runs when an input or
output changes, and shaderc builds relatively quickly it seems ok to have the
script always blow away the output dir.

[borenet, 2016-04-13 14:45:00]

LGTM

[bsalomon, 2016-04-13 14:53:07]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2016-04-13 14:53:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1884963002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1884963002/40001

[commit-bot: I haz the power, 2016-04-13 15:02:44]

Description was changed from

==========
Make build_shaderc.py blow away output dir and allow build_type arg to contain
either Debug or Release

GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Make build_shaderc.py blow away output dir and allow build_type arg to contain
either Debug or Release

GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/09e127bd38d4f972134afca77184b217a9708b3a
==========

[commit-bot: I haz the power, 2016-04-13 15:02:45]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/09e127bd38d4f972134afca77184b217a9708b3a