The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cc46b05b55683ecf63128f6062811093fcf2ad79

commit cc46b05b55683ecf63128f6062811093fcf2ad79
Author: Joy Ming <jming@chromium.org>
Date: Fri Aug 11 00:41:59 2017

Create a class to start and stop the foreground service for downloads.

This is one of the steps in the refactor to make downloads a foreground
service. This step creates a separate class that manages starting and
stoping the foreground service. Currently, this is not being used by
any of the classes, but will eventually be integrated to be called
every time there is a change in a download (ie. a download has been
started, paused, resumed, completed, canceled, or deleted).

Bug:  747571 , 747563 
Change-Id: Ie9a7ee2950481b5c403e09ede535f763ef44d653
Reviewed-on: https://chromium-review.googlesource.com/572147
Commit-Queue: Joy Ming <jming@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#493619}
[add] https://crrev.com/cc46b05b55683ecf63128f6062811093fcf2ad79/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadForegroundService.java
[add] https://crrev.com/cc46b05b55683ecf63128f6062811093fcf2ad79/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadForegroundServiceManager.java
[modify] https://crrev.com/cc46b05b55683ecf63128f6062811093fcf2ad79/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationConstants.java
[modify] https://crrev.com/cc46b05b55683ecf63128f6062811093fcf2ad79/chrome/android/java_sources.gni
[add] https://crrev.com/cc46b05b55683ecf63128f6062811093fcf2ad79/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadForegroundServiceManagerTest.java