This reverts commit 971b19d0c6.
Reason for revert: See if this CL was causing the Perf-Win10-Clang-ShuttleA-GPU-GTX660-x86_64-Release-All issue
Original change's description:
> Remove SkBaseDevice::flush
>
> Another small step in removing SkCanvas::flush
>
> Change-Id: I6f17edcd1996e1009dad7cc96a97be3b0c4664f4
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/334417
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Adlai Holler <adlai@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>
TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com,adlai@google.com
Change-Id: I0b9116f8ce4eed3a0d49ccf1cc55d8d89675617e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335216
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
b7c1310834