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This CL adds an extra string to the Desktop PWA window title that
denotes which app the window belongs to and the domain of the start URL.
The window title is painted such that the page title will elide first,
followed by the app name then the domain. Further work is required to
maintain this property for all languages.

Bug: 762401
Change-Id: Ibcc697b02fa643df9c2618ca0ef0249c6f887b64
Reviewed-on: https://chromium-review.googlesource.com/768601
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517782}