There are legacy apps that have uniforms declared with
different precisions across shaders. There is some wiggle
room in the ESSL spec to accommodate such cases as long as
the uniforms are not statically used in shaders. We choose
this lenient interpretation since it allows for more apps
to be compatible with ANGLE.

This change allows BADLANDS to progress past a black screen.

Bug: angleproject:4971
Tests: angle_end2end_tests
           --gtest_filter=GLSLTest_ES31.UniformPrecisionMatchValidation*
Change-Id: Icdd2056c8415803eb34f2840b0758e1acf53c23a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2495493
Commit-Queue: Mohan Maiya <m.maiya@samsung.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>