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Manifest parser can now parse protocol_handlers

This feature allows the blink parser to parse protocol_handlers
defined in its app manifest. It is checked in behind the
flag ParseUrlProtocolHandler.

The current CL does not include semantic validation of the scheme.
We will include it in a subsequent CL to keep CLs small and scoped.

This feature is part of a Chrome experiment, see the feature page:
https://chromestatus.com/features/5151703944921088

The URLProtocolHandler explainer can be found here:
https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/URLProtocolHandler/explainer.md

The main bug link is: https://bugs.chromium.org/p/chromium/issues/detail?id=1019239

The blinkdev proposal is here: https://groups.google.com/a/chromium.org/forum/?hl=en#!topic/blink-dev/x4Ev_l9Oj2U

Bug: 1019239
Change-Id: I85a99064485f12e7c224bdaf491ad413e451229c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2211200Reviewed-by: Alex Russell <slightlyoff@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Samuel Tang <samtan@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#774211}