GitLab

This code is disabled by default behind
kDesktopPWAsWithoutExtensions base feature.

WebAppSyncBridge should encapsulate the sync change processor
and the unified store (LevelDB).

Effectively, WebAppSyncBridge becomes the storage controller
("cloud" storage + local LevelDb). WebAppSyncBridge should handle
and coordinate any changes.

As a consequence:
Rename AbstractWebAppDatabase to AbstractWebAppSyncBridge.

In next CLs:
1) WebAppRegistry should become read-only model (M in MVC)
for external subsystems other than WebAppSyncBridge.
2) The writeable batch updates API will be moved out
of WebAppRegistry to WebAppSyncBridge. WebAppSyncBridge is
C in MVC.
3) WebAppSyncBridge should use WebAppRegistry (the model) in
one way dependency: we will erase AbstractWebAppSyncBridge
interface. There will be no pointer from registry to sync bridge.

Illustrational diagram is in progress.

Bug: 860583
Change-Id: Idecbfdca14513b5826e91435cb945cbb5cca52a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803017
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697117}