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By auto-generating those entries, we can stop requiring people to manually
update lists such as |generated_core_dictionary_files| every time Blink's
lists of IDL dictionary files change.

Since the names of the generated .cpp/.h follow a fixed, specific format
that only depends on their respective IDL file's path and file name, we can
use GN itself to do some path introspection and generate the file names we
want in idl_impl().

While here, change the names of idl_impl()'s required arguments to make
their purpose more explicit: it is not immediately obvious that we
differentiate unions and callback functions from dictionary files in terms
of where the latter are generated and their file names, as well as why
idl_impl() only expects non-dictionary files in its outputs list. A good
next step would be generating dictionary impl files separately from unions
and callbacks to avoid the confusion altogether.

Bug: 725996
Change-Id: I41b06e8d71f33b21d77944216fcb07d0557ac47b
Reviewed-on: https://chromium-review.googlesource.com/517795
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476262}