Generate resource pak files for top chrome material design assets

Generate the pak files
theme_resources_material_{100,200}_percent.pak
which contain material design versions of
the theme resources specified in
theme_resources.grd. Note that these data packs
do not fall back to non-material resources
when the material resource is missing; as a
result, the packs do not duplicate the resources
contained within
theme_resources_{100,200}_percent.pak.

This CL also includes gypi and GN changes
in order to repack into
chrome_material_{100,200}_percent.pak,
conditional on the ENABLE_TOPCHROME_MD
compile-time flag.

BUG=503754
TEST=none

Review URL: https://codereview.chromium.org/1197813002

Cr-Commit-Position: refs/heads/master@{#336661}
6 files changed