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This CL splits the definition of GLImageBindTest and
GLImageZeroInitializeTest out into their own header files so source
files that don't use them don't trigger the following warnings in
gl_unittests:
The following parameterized test case is not instantiated: UninstantiatedTypeParamaterizedTestSuite<GLImageBindTest>
The following parameterized test case is not instantiated: UninstantiatedTypeParamaterizedTestSuite<GLImageZeroInitializeTest>

Bug: 1045846
Change-Id: If64404d069b60405c6333f8a77abda85a5b11bd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143777
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759173}