No VS specialization for identity or scale/trans in reduced shader mode

Modifies helpers on GrGLSLGeometryProcessor that insert, set, and make
keys for view/local matrix uniforms to not omit the uniform when
the matrix is identity or use a float4 when it is scale/trans. Always
uses a 3x3.

Bug: skia:11844
Change-Id: I0f25b60b46b8932d7e2cac4a50159d22b9cd84d2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/395656
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
32 files changed