Roll gyp to 4a9b712d5cb4a5ba7a9950128a7219569caf7263.

Roll gyp to 4a9b712d5cb4a5ba7a9950128a7219569caf7263.

This picks up a bug fix for the analyzer to handle multiple
toolsets the same way that ninja does.

It also picks up a couple of stray changes that were landed
after the migration to Git.

TBR=scottmg@chromium.org, sky@chromium.org
BUG=461811
Committed: https://crrev.com/f33f9652fec179ba4e13a28ac0767e46554a6023
Cr-Commit-Position: refs/heads/master@{#318979}

[Dirk Pranke, 2015-03-03 22:33:33]

dpranke@chromium.org changed reviewers:
+ sky@chromium.org

[Dirk Pranke, 2015-03-03 22:33:36]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-03-03 22:34:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/973273002/1

[scottmg, 2015-03-03 22:37:09]

lgtm

[commit-bot: I haz the power, 2015-03-04 00:40:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 00:41:29]

Patchset 1 (id:??) landed as
https://crrev.com/f33f9652fec179ba4e13a28ac0767e46554a6023
Cr-Commit-Position: refs/heads/master@{#318979}