These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libwebm-1.0.0.32:0/1.0.0.32::gentoo  490 KiB

Total: 1 package (1 new), Size of downloads: 490 KiB