Move control of explicit GPU resource allocation to GrContextOptions

Change-Id: Ic284acc79bab5936f0007d5ae5fb1e7a9929e2af
Reviewed-on: https://skia-review.googlesource.com/104880
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
19 files changed