Rename view getters in various image subclasses.

This also changes the SkImage_Base header to return a const& view and
then removes the equivalent version in SkImage_GpuBase.

Bug: skia:9556
Change-Id: Ica096693a22c0fc590786058c055fb28387c80a1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268624
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Auto-Submit: Greg Daniel <egdaniel@google.com>
24 files changed