The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/556227a5a0ebb6a048b8ae89648b306a88f74c84

commit 556227a5a0ebb6a048b8ae89648b306a88f74c84
Author: Michael McGreevy <mcgreevy@chromium.org>
Date: Thu Nov 16 07:47:24 2017

Add a PWA install confirmation dialog.

This dialog will be displayed in response to any of the following:
* user clicks on the "Add to Desktop" menu item
* user clicks on the omnibox badge
* developer calls beforeinstallprompt.prompt()

Bug:  783480 

Change-Id: I5af411d4fe826902e664f72f67ac4f66c9151756
Reviewed-on: https://chromium-review.googlesource.com/726958
Commit-Queue: Michael McGreevy <mcgreevy@chromium.org>
Commit-Queue: Ben Wells <benwells@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517018}
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/extensions/bookmark_app_helper.cc
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/extensions/bookmark_app_helper_browsertest.cc
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/BUILD.gn
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/browser_dialogs.h
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/bookmark_app_confirmation_view.cc
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/bookmark_app_confirmation_view.h
[add] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/pwa_confirmation_view.cc
[add] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/pwa_confirmation_view.h
[add] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/pwa_confirmation_view_browsertest.cc
[add] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/web_app_info_image_source.cc
[add] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/browser/ui/views/extensions/web_app_info_image_source.h
[modify] https://crrev.com/556227a5a0ebb6a048b8ae89648b306a88f74c84/chrome/test/BUILD.gn