The recently approved EAPI 5 adds a feature called "slot-operator dependencies" to the package manager specification. Once these dependencies are implemented in the portage tree, the package manager will be able to automatically trigger package rebuilds when library ABI changes occur. Long-term, this will greatly reduce the need for revdep-rebuild.
I have forked the dev-lang/v8 and www-client/chromium ebuilds into my overlay to test this new feature; we can't really apply it in the main portage tree until a new enough version of portage has been stabilized. I will be maintaining the latest chromium dev channel release, plus a couple of versions of v8 in my overlay.
If you would like to try it out, you can install my overlay with layman -a floppym. Once you've upgraded to the versions in my overlay, upgrading/downgrading dev-lang/v8 should automatically trigger a chromium rebuild.
If you run into any issues, please file a bug.