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Because we now show the caption bar and caption buttons in Windows in
tablet mode in order to provide a dedicated grab handle for moving to/
from split-screen mode (and protect user gestures to open the tabstrip)
there is now empty space above the toolbar.

Filling this empty space with the window title:
- makes us consistent with PWA windows
- provides access to the page title without opening the tabstrip

Currently, this change only affects Windows and not ChromeOS.

Screenshot (Google only):
https://photos.google.com/share/AF1QipP8IFSTPydtpfbRM5vXfqQEfVDPVwq1kJDBMtCwes8AqxEqUdjIwsi5i2v1hUpmFg?key=WFkxdDVZR2ktU3c2dWNPU1lCRFRJSk55TGUtTDFR

Bug: 1116651
Change-Id: Ib90149c6d46bf740505d1a06be824b85d3e5dee1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364958Reviewed-by: Collin Baker <collinbaker@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800389}