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getRPTextureSize is a function that is used for getting render pass
texture size, which is not used since the size is stored implicitly
inside the actual texture size.

R=enne@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I5c68546802eeeb607acd9f07a0d6f0fc11b26453
Reviewed-on: https://chromium-review.googlesource.com/899771Reviewed-by: enne <enne@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534784}