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Add a file_manager/resources/BUILD.gn action('gen_main_html') to use a
script to auto-generate SWA main.html from files app main.html.

Update file_manager/resources/file_manager_resources.grd file to fetch
auto-generated SWA main.html from the generated resources directory.

Bug: 1113981
Change-Id: I116d5fb15e63148e3a1cdbe9cf7e179a53165957
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536584
Auto-Submit: Noel Gordon <noel@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827733}