gpu: Add ANGLE commit to program cache hash.

gpu: Add ANGLE commit to program cache hash.

ANGLE rejects program binaries compiled from a different ANGLE,
because the program format can change, and other incompatibilities.
Add the commit id to the cache hash so the cache layer can skip
trying to compile these shaders.

This change should mostly affect developers who are testing Chrome
and modifying ANGLE between compiles.

BUG=510151
Committed: https://crrev.com/dc26192a317d9511ce983fd4b26b1130fe25761a
Cr-Commit-Position: refs/heads/master@{#341713}

[Jamie Madill, 2015-07-31 14:19:54]

jmadill@chromium.org changed reviewers:
+ dyen@chromium.org, vmiura@chromium.org

[Jamie Madill, 2015-07-31 14:19:54]

PTAL - I tested this manually. Didn't seem as simple to add a test in the
unittests without refactoring the code, but can if required.

[Jamie Madill, 2015-07-31 21:06:45]

jmadill@chromium.org changed reviewers:
+ piman@chromium.org

[Jamie Madill, 2015-07-31 21:06:45]

piman@chromium.org: PTAL, added a change to the gypi.

[Jamie Madill, 2015-08-03 14:29:04]

Review pings!

[David Yen, 2015-08-03 17:20:53]

LGTM (Although I'm not an owner)

[vmiura, 2015-08-03 17:51:02]

lgtm

[piman, 2015-08-03 22:09:53]

lgtm

[Jamie Madill, 2015-08-03 22:26:02]

The CQ bit was checked by jmadill@chromium.org

[commit-bot: I haz the power, 2015-08-03 22:26:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1261353003/50001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1261353003/50001

[commit-bot: I haz the power, 2015-08-03 23:45:50]

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

[commit-bot: I haz the power, 2015-08-03 23:45:51]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Jamie Madill, 2015-08-04 12:39:24]

The CQ bit was checked by jmadill@chromium.org

[commit-bot: I haz the power, 2015-08-04 12:39:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1261353003/50001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1261353003/50001

[commit-bot: I haz the power, 2015-08-04 12:44:43]

Committed patchset #4 (id:50001)

[commit-bot: I haz the power, 2015-08-04 12:45:28]

Patchset 4 (id:??) landed as
https://crrev.com/dc26192a317d9511ce983fd4b26b1130fe25761a
Cr-Commit-Position: refs/heads/master@{#341713}