Update tests and canvas subclasses to expect drawImageRect calls

As part of the the linked staging flag CL,
removing SK_RESOLVE_FILTERS_BEFORE_RESTORE has
SkCanvas::drawImage call into onDrawImageRect with a src rect
matching the image dimensions. onDrawImage() is no longer called
and will be removed from the SkCanvas API at a later point.
This removes all of the overrides that I could find in HWUI.


Bug: b/40042615
Change-Id: I4feea19d7622b217e0cf2c6fcc06f64e6427caa7