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Transfering ImageBitmap should decrement memory usage on the original
V8 isolate, and closing should decrement memory usage, otherwise
unnecessary GCs are triggered.

Change-Id: Iff36735ad67136650869da90a4bb07ca0632d4dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700636Reviewed-by: Yi Xu <yiyix@chromium.org>
Reviewed-by: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818109}