Shared Storage: Add web test for img request in sandboxed iframe
This test documents the current behavior of shared storage via
response header by way of an image request. We will revise the test
if we update the behavior.
Bug: 339172115
Change-Id: I4e2d10f72d5464aa2bdab1f9cfd73319176bfcc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5522953
Reviewed-by: Yao Xiao yaoxia@chromium.org
Commit-Queue: Cammie Smith Barnes cammie@chromium.org
Cr-Commit-Position: refs/heads/main@{#1298205}