Update to use CGL crate for mac.

[glennw]

No description provided.

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/3018

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[glennw]

r? @metajack (relies on submodules being merged first)

[metajack]

This needs a rebase.

[glennw]

Yep - I will wait until the linux/glx one merges first though, because it will need another rebase after that.

[glennw]

Rebased - this diff is much simpler now - tested that it builds on linux, mac, cef, android.

[metajack]

r+

[bors-servo]

saw approval from metajack
at glennw@5e5f761

[bors-servo]

merging glennw/servo/cgl = 5e5f761 into auto

[bors-servo]

glennw/servo/cgl = 5e5f761 merged ok, testing candidate = b8de54b

[bors-servo]

all tests pass:
success: http://build.servo.org/builders/linux/builds/482
success: http://build.servo.org/builders/mac1/builds/27
success: http://build.servo.org/builders/mac2/builds/26

[bors-servo]

fast-forwarding master to auto = b8de54b