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cc: clang-format shader.cc

Previously this file could not be formatted because of all the shader
code in magic macros to make it less irritating to edit.  It turns out
"clang-format off" and "clang-format on" in comments make it possible to
selectively apply formatting, so do this for all the shaders.

R=danakj@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/658153003

Cr-Commit-Position: refs/heads/master@{#299996}