Teach inspector about 4:1 block sizes
Teach inspector about 4:1 block sizes

Change-Id: I5d60cc74233bf7ddf56bcd0c3e8b8d012a6e5a63

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom