Revert "Clean up onTransferPixels"

This reverts commit f7037d003c936f59e4d02244821e223c2e7af8e8.

Reason for revert: Issues on test bots.

Original change's description:
> Clean up onTransferPixels
> 
> Bug: skia:5126
> Change-Id: I323c50e7854744302007b4ae7bd25e5742c14cbc
> Reviewed-on: https://skia-review.googlesource.com/19055
> Commit-Queue: Jim Van Verth <jvanverth@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com,brianosman@google.com

Change-Id: I923fda4d5cd8c2896fb347f9b2695b7f83d9137b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:5126
Reviewed-on: https://skia-review.googlesource.com/20444
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
11 files changed