Created attachment 265761 [details, diff] Install multiple icon sizes in live ebuild Chromium upstream provides icons in multiple sizes, but we only install the 48x48 pixel version. Other sizes may be installed to /usr/share/icons/hicolor. See URL for the freedesktop.org spec.
Adding links to related upstream issues.
*** Bug 358763 has been marked as a duplicate of this bug. ***
Andreas' patch on bug 358763 has some eclass calls to rebuild the gnome icon cache, so you may want to incorporate that.
Patch applied (suka's version). Thanks!