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While investigating power usage on Android, it turned out that images
were being double decoded.  This is because DrawImageRect was not
including the scale of src->dst rects when serializing images and
requesting them from the decode cache.

Bug: 850362
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iff305092de5b23e2cdb327ecc53bb575ae2fc141
Reviewed-on: https://chromium-review.googlesource.com/1102102Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567750}