Add HiDPI variants of the chromium logo.
The images in default_100_percent are currently in
chrome/app/theme/chromium as well. I'll remove them from
there once the grd changes to use the new location are in.
These icons aren't used anywhere yet, so no functionality
change.
BUG=
134372
TEST=none
TBR=flackr
Committed:
https://src.chromium.org/viewvc/chrome?view=rev&revision=145147