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File loading and app initialization are interleaved. Because
the test Exif file is small, the codepath taken when file loading
"wins" is taken in about 10% of test runs. RAW files need a delegate
to extract an image preview, and this wasn't being set on this codepath
until app initialization. This could cause the test to attempt to load
the RAW file as a JPEG, resulting in a "decode" error.

To fix, ensure a delegate is set along with the file list to load during
app initialization when that codepath is taken.

Bug: 1152318
Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Change-Id: I12b37c3f6b6228c621fdb36f975200c74da5d227
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2562921Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832600}