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Currently make_names.py produces blink::FooBarNames::baz_hoge constant
variables. They don't match to Google C++ style.  This CL adds
capability to produce code following Google C++ style.

If 'namespace' field in foo_bar_names.json5 contains capital letters,
the behavior isn't changed.
Otherwise,
 - Don't append 'Names' to C++ namespace
 - Prepend 'k' to UpperCamelCase names
So 'blink::foo_bar::kBazHoge' will be produced.

Bug: 889726
Change-Id: Iac8ca8040782c440d755067bec7c738d92189878
Reviewed-on: https://chromium-review.googlesource.com/c/1288518Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601343}