SkQP: use bitmap.pixmap()

Change-Id: I8e372f75a1a0b32db88808b0b4d7314c7fba9cda
Reviewed-on: https://skia-review.googlesource.com/97161
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed