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Plumb the flag --disable-mac-overlays.

Update CALayer parameters to make the IOSurfaces CAContextID mutually
exclusive (otherwise we get warned that the IOSurface mach port is
invalid, when it is expected to be invalid).

R=dcheng, fsamuel
TBR=avi (content/)

Bug: 772576
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Iaa2f2fdfb6dbb4135bd989f4c2af1ab6be892a1a
Reviewed-on: https://chromium-review.googlesource.com/882316
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532269}