Untangle GrSurfaceDrawContext.h, GrTextureOp.h and GrFillRectOp.h

The dependencies between these headers made modifying the SDC and Ops separately somewhat difficult.

Bug: skia:11837
Change-Id: I0c3ca118ce206bf8db5b6753be1ef46531ae1f58
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/430041
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
13 files changed