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The crash in gpu::ImageReaderGLOwner::UpdateTexImage() is because
ImageReaderGLOwner only allows one image ref, SharedImageVideo doesn't
release the image ref when read access is finished. It releases the ref
when the SharedImageVideo is destroyed. Fix the problem by releasing
the image ref in EndReadAccess().

Bug: 1059461
Change-Id: I4ccc509bd48dfd6bb576212df32bd411f521e281
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096777Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748845}