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Makes the loading-progress animation smoother for pages that have not
finished loading pretty-much instantly. A follow-up might consider
removing actual loading progress completely and just animate to 70%
slowly until loading finishes.

Bug: chromium:908920
Change-Id: I207d602c1552591396840c346e88b0962af07be2
Reviewed-on: https://chromium-review.googlesource.com/c/1358923Reviewed-by: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613199}