[INTERNAL] add intellij.editor package (c'd d8df4d)

Add further classes

Change-Id: Ibb01f4b0b2eb05a95cdf4acd39bb6251a02e7566
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1770
Tested-by: Jenkins CI
Reviewed-by: Holger Schmeisky <google@schmeisky.com>