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This CL enables Push Subscriptions to support a expiration time, set by
Chrome in push_messaging_constants.h (currently 90 days). This feature
is disabled by default, so to try it out you must set --enable-features=
PushSubscriptionWithExpirationTime.

3 BrowserTests are added to check the expiration time behaviour when the
flag is set or not set.

The expiration time is set in PushMessagingServiceImpl when a
subscription is made and saved by PushMessagingAppIdentifier in the
browser preference. The following CLs prepare for this change:

1. 2292292: [Push] Add expirationTime attribute to PushSubscription
https://chromium-review.googlesource.com/c/chromium/src/+/2292292

2. 2302192: [Push] Pass expirationTime attribute from
PushMessagingService to PushManager
https://chromium-review.googlesource.com/c/chromium/src/+/2302192

3. 2315682: [Push] Add expiration time property in app identifier
https://chromium-review.googlesource.com/c/chromium/src/+/2315682


Bug: 1104215
Change-Id: I341f05096fa57246fa18cb338a1a59f7a1ae01ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302610Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Commit-Queue: Viviane Yang <viviy@google.com>
Cr-Commit-Position: refs/heads/master@{#793653}