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The tests that now run for YUV decoding are MipsAddedWhileOriginalInUse,
MipsAddedSubsequentDraw, and BasicMips.

This change adds a helper method to GpuImageDecodeCache called
GetUploadedPlaneForTesting and makes a few additional miscellaneous
fixes to the cache.

Bug: 900672
Change-Id: I7563206944125cdcea168ca3264c85ea5eb8e7fa
Reviewed-on: https://chromium-review.googlesource.com/c/1471261
Commit-Queue: Madeleine Barowsky <mbarowsky@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632750}