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Use the this.renderOrientation_ feature for better cache keying of RAW
image thumbnails from piexwasm. The client's this.request_.orientation
forms part of the image loader cache key: we should leave it alone and
using this.renderOrientation_ allows us to do that.

To be clear, further testing of RAW images that have EXIF orientation,
has shown that they are _not_ affected by issue 1152084.

Bug: 1152084
Change-Id: I7665985df51ddecdb4bb5bebf2437f910d82330b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569317
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Auto-Submit: Noel Gordon <noel@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833051}