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Storing the bound textures in flat arrays significantly improves the
performance of binding textures in the passthrough command decoder.

BUG=angleproject:2188

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ibb9dca361a2d598aece5b9ed7ed2e373ae9b7183
Reviewed-on: https://chromium-review.googlesource.com/811765
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527091}