[automerger skipped] Merge "Support Skia's gray SkColorSpaces" into rvc-dev am: b86e5a77a1 am: 581b9a6c32 -s ours

am skip reason: Change-Id I94fe232e10f56a69832d4a39a2e5909eac641264 with SHA-1 865f0f1ec9 is in history

Change-Id: I640708eaacad466fb14a8d9179e0bf152803b0e1