The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c0fe73103abe68313dcd49155dbd0c6ca5c11b44

commit c0fe73103abe68313dcd49155dbd0c6ca5c11b44
Author: Luna Lu <loonybear@chromium.org>
Date: Tue Nov 06 15:16:12 2018

Update feature policy unoptimized-images policy

After research, tentatively updating the unoptimized-images policy as:
no using more than 0.5 byte per pixel of image data with approximate
header size (1KB) removed.

Bug:  901925 
Change-Id: Ibc5b2e2e6ccaba7a273c63440d48d4e0d154cc2e
Reviewed-on: https://chromium-review.googlesource.com/c/1318372
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Paul Meyer <paulmeyer@chromium.org>
Commit-Queue: Luna Lu <loonybear@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605677}
[modify] https://crrev.com/c0fe73103abe68313dcd49155dbd0c6ca5c11b44/third_party/WebKit/LayoutTests/TestExpectations
[add] https://crrev.com/c0fe73103abe68313dcd49155dbd0c6ca5c11b44/third_party/WebKit/LayoutTests/http/tests/images/feature-policy-unoptimized-images-cached-image-expected.png
[add] https://crrev.com/c0fe73103abe68313dcd49155dbd0c6ca5c11b44/third_party/WebKit/LayoutTests/platform/mac/http/tests/images/feature-policy-unoptimized-images-cached-image-expected.png
[add] https://crrev.com/c0fe73103abe68313dcd49155dbd0c6ca5c11b44/third_party/WebKit/LayoutTests/platform/win/http/tests/images/feature-policy-unoptimized-images-cached-image-expected.png
[add] https://crrev.com/c0fe73103abe68313dcd49155dbd0c6ca5c11b44/third_party/WebKit/LayoutTests/platform/win7/http/tests/images/feature-policy-unoptimized-images-cached-image-expected.png
[modify] https://crrev.com/c0fe73103abe68313dcd49155dbd0c6ca5c11b44/third_party/blink/renderer/core/loader/resource/image_resource_content.cc