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Add "basename" parameter to template("generate_global_constructors"),
and generate snake_case IDL files and C++ header files.

This is a preparation of the Great Blink mv. At this momnet, we only
have lists of global scope interface names in *.gn. After the great mv,
it's difficult to produce generated IDL list and C++ header list from
the interface names in *.gn. So we need to introduce additional
snake_cased interface list.

Bug: 578345
Change-Id: Ia7f861e43d9b622926adde0280e4297c71bcc750
Reviewed-on: https://chromium-review.googlesource.com/672225Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502817}