Rich Text Editor:Placeholder State Theme Matrix

Build 8612 on users/aagash/mention-in-editor
1200px
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Baseline History
Build 8612e9f5eb7
Current build. There are unaccepted changes, so build 7872 is still the baseline.
Build 7535b9b5a20
Accepted by Jesse Attas.
Build 73084ca3caa
Accepted by Vivin Krishna.
Commenting is disabled because there's a newer build on this branch