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This closely matches Android Download Manager's UI with the exception of skipping the "% downloaded" part since it seemed redundant with the progress bar. The embedder can disable the UI if they choose.

The few UI strings need to be translated. The button strings can be reused from Chrome, but we need to figure out what the rest of the text should say and add translations if they're not shared.

Bug: 1025603
Change-Id: I61ba3b821c417de13191a67a85487b61b5f9c86f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002980Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734589}