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Add DCHECK for conditions that fails to launch Files app.

Add warning log if can't launch Files app when it isn't ready.

Bug: 1090211
Change-Id: Iec2a20bb648354e83b7f7fa95df380b1f5182dca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390929
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804250}