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Principally, this ensures that the Camera App opens the correct "camera
roll" app, depending on whether the "Media App" SWA is enabled. It
does this by intercepting the request to executeTask with the Gallery
app, but allows the Gallery app to still open RAW image file types.

No effect when chrome://flags#media-app is not enabled.

Except for RAW files, we will hide the Gallery as a file handler
option in the files app in a follow-up so that users are not
confused why selecting it also results in the Media App being
launched.

Bug: 1030935, b/153387960
Change-Id: Ibe63455e8dd247769fabd123edb4925b8bae3739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143417
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759170}