Adding SwiftShader compilation on Windows

Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The 'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but was unaccessible due to not being referenced in any other BUILD.gn files. Note that SwiftShader does not automatically build with Chromium.

BUG=630728

[sugoi1, 2016-09-19 18:15:31]

Description was changed from

==========
Test to compile SwiftShader on different platforms

BUG=
==========

to

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728
==========

[sugoi1, 2016-09-19 20:26:17]

sugoi@chromium.org changed reviewers:
+ thakis@chromium.org

[sugoi1, 2016-09-19 20:26:18]

3rd attempt. It seems landing this for Windows and Linux simultaneously was a
bit ambitious. The Linux issue doesn't seem very trivial at this point, so let's
try Windows only first to see if there are more issues left that the original
one (I don't think we got Windows failures last time, but maybe we reverted
before more appeared). Let's try to land this and watch the bots...

[sugoi1, 2016-09-19 21:11:41]

The CQ bit was checked by sugoi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-19 21:12:33]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-19 21:26:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-19 21:26:36]

Dry run: This issue passed the CQ dry run.

[Nico, 2016-09-19 22:48:15]

lgtm, good luck

Please warn sheriffs and be on IRC

[sugoi, 2016-09-20 12:49:33]

The CQ bit was checked by sugoi@google.com

[commit-bot: I haz the power, 2016-09-20 12:49:54]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-20 12:54:12]

Description was changed from

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728
==========

to

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728
==========

[commit-bot: I haz the power, 2016-09-20 12:54:13]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-09-20 12:55:32]

Description was changed from

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728
==========

to

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728

Committed: https://crrev.com/abe918907ad9cb56a09000919fc1ed5fda90fb8d
Cr-Commit-Position: refs/heads/master@{#419731}
==========

[commit-bot: I haz the power, 2016-09-20 12:55:33]

Patchset 3 (id:??) landed as
https://crrev.com/abe918907ad9cb56a09000919fc1ed5fda90fb8d
Cr-Commit-Position: refs/heads/master@{#419731}

[sugoi, 2016-09-20 12:55:35]

Description was changed from

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728

Committed: https://crrev.com/abe918907ad9cb56a09000919fc1ed5fda90fb8d
Cr-Commit-Position: refs/heads/master@{#419731}
==========

to

==========
Adding target to build SwiftShader

Added the swiftshader target to BUILD.gn's deps in order to enable building
SwiftShader using 'ninja -C out/Default swiftshader' or similar command. The
'swiftshader' target already existed in third_party/swiftshader/BUILD.gn, but
was unaccessible due to not being referenced in any other BUILD.gn files. Note
that SwiftShader does not automatically build with Chromium.

BUG=630728
==========

[Nico, 2016-09-21 16:54:42]

I don't know how you picked bots, but don't just run "all of them". This one ran
on win_upload_clang, a bot responsible for building new clang binaries and
uploading them. Using it on regular chromium CLs doesn't make sense.