Reland "Use DEPS instead of DEPS.chromium to recurse into ANGLE."

This is a reland of 628b2c85357306dbf390faebd0d0768f3eeba293

The revision of depot_tools was updated for internal recipes.

Original change's description:
> Use DEPS instead of DEPS.chromium to recurse into ANGLE.
>
> ANGLE's DEPS file knows now what to sync when building with Chromium.
>
> Introduce the 'angle_root' variable that we need to tell ANGLE to sync
> in third_party/angle.
>
> Bug: 782846
> Change-Id: I26c5f48b7e4bc5a3f435d3de64d99bccb49a9555
> Reviewed-on: https://chromium-review.googlesource.com/1083229
> Commit-Queue: Edward Lesmes <[email protected]>
> Reviewed-by: Jamie Madill <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#563898}

Bug: 782846
Change-Id: Ie0bfc5e83177944246e26fb788a341e54b784adb
Reviewed-on: https://chromium-review.googlesource.com/1099435
Reviewed-by: Michael Moss <[email protected]>
Commit-Queue: Edward Lesmes <[email protected]>
Cr-Commit-Position: refs/heads/master@{#566991}
1 file changed