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This CL adds a "launch_query_params" field to default web app JSON
configs that causes the web app to launch with the specified query
params appended to the app's start_url.

Bug: 1045537
Change-Id: Ib6025ae39eac7a6f710b2817a0f2ad30437e29c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377044Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811641}