Implement drawImage in terms of drawImageRect

This will cause the raster backend to draw shadermask_image incorrectly since
drawImageRect implementation has the wrong semantics. bitmapshader's expected
behavior has changed: GPU will draw the new version correctly, but raster's
will not change from the old, incorrect behavior.

Bug: skia:8752
Change-Id: Iee89082e2fdf95c2ee42ca3b052e65556f327eff
Reviewed-on: https://skia-review.googlesource.com/c/190675
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
17 files changed