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Adds a mechanism to notify GrGLSLVaryingHandler that a shader will not
emit geometry in perspective. This gives it a chance to use the
noperspective keyword if it is supported.
Updates the existing processors to notify the varying handler when
there is no perspective.
Begins using the noperspective keyword in GrGLGpu internal shaders.
Web scenes with observable benefit (Pixel C, gpu config):
tabl_nofolo.skp 4.62 -> 3.33 ms 28%
desk_tigersvg.skp 26.5 -> 24 ms 9%
desk_pokemonwiki.skp 16.1 -> 14.9 ms 7%
tabl_deviantart.skp 3.97 -> 3.7 ms 7%
desk_gws.skp 3.85 -> 3.65 ms 5%
Also adds new methods for creating varyings with flat interpolation.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1673093002
Review URL: https://codereview.chromium.org/1673093002
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cdalton
egdaniel