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Adds a histogram that measure the time taken it took from
loading the page to when the user starts watching.

Change-Id: Ifbbcb5ca07c8554e7157ba1b07d3015fb801fe35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537777
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828901}