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Ensure that RenderFrameHostTester::SimulateLoadingCompleted
fires DocumentAvailable / DOMContentLoaded / OnLoadCompleted / DidStopLoading
callbacks in addition to DidStopLoading to simulate real-world loading
callback sequence more accurately.

This patch also adds a browser test to ensure that the loading callback
order is the same in the real world.

This patch is a prerequisite for exposing the loading stages from
RenderFrameHost / WebContents as the tests need these callbacks to
be dispatched to work correctly.

R=clamy@chromium.org,arthursonzogni@chromium.org,ahemery@chromium.org
TBR=jianli@chromium.org,pasko@chromium.org,dbeam@chromium.org,mastiz@chromium.org,drubery@chromium.org
CC=​​bfcache-bugs@chromium.org
BUG=1011770

Change-Id: Ibe59b1b131f3911fe9c4bf641e8ea1c6bb1ba545
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834343
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705655}