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WebGL 2.0 may modify texture unit 0 & sampler unit 0. However we
create Skia GrContext with a ES2 context. So the skia isn't aware
of the sampler unit and it will not restore sampler unit when
GrContext::resetContext() is called. Fix the problem by restoring
sampler unit 0 to ground state in
ContextState::RestoreAllTextureUnitAndSamplerBindings()

Bug: 1057271
Change-Id: I9d4c15d975236e50bfa726669eb8cbdf25b736b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148953Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759004}