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This CL is related to two ongoing projects: the implementation of file
handling APIs for PWAs in Chrome (go/chrome-file-handling-api), and
BMO (go/chrome-bmo), which is concerned with moving PWAs off the
Extensions stack and establish them on an independent web apps
platform.

As part of the first project, we created a new representation for file
handlers (apps::FileHandler) that has some properties needed for OS
integration. Pre-BMO PWAs ("Bookmark Apps") use apps::FileHandlerInfo.
It's simple to convert from FileHandler to FileHandlerInfo, but
impossible to do the reverse. This means that if file handling lands
before BMO, migrating installed PWAs to the new system will be a
destructive operation.

The goal for the set of CLs to which this one belongs is to have BMO
web apps and Bookmark Apps share the apps::FileHandler representation.
We have added a new "web_app_file_handlers" key to the Extension
manifest, along with parsing for the new format (crrev.com/c/2081714).
Here we serialize the apps::FileHandlers attached to a web app (under
the new key) when installing it as a Bookmark App. In subsequent CLs,
we replace apps::FileHandlerInfo with apps::FileHandler across both
Bookmark Apps and BMO web apps (crrev.com/c/2087306), and finally
implement migrating Bookmark App file handlers to the new platform as
a simple copy (crrev.com/c/2086453).

Bug: 938103
Change-Id: Iec258386be92ae36b8016a21119ee324a955e5d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087327Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Robert Woods <robertwoods@google.com>
Cr-Commit-Position: refs/heads/master@{#750367}