Compute more accurate containedInClip

Eventually, we'll remove containedInClip from the function parameters
and just compute it using ir and clipBounds. The current approach is
for preparing rebaseline.

TBR: reed@google.com
Bug: skia:7271
Change-Id: Ife60e173d9f4f1c9ec80d13a2f7a88a0433b61e9
Reviewed-on: https://skia-review.googlesource.com/69220
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
3 files changed