Fix observe framebuffer.
Fix observe framebuffer.

Qining/gapid,Qining/gapid,google/gapid,pmuetschard/gapid,google/agi,google/gapid,google/gapid,google/gapid,pmuetschard/gapid,google/agi,google/agi,pmuetschard/gapid,pmuetschard/gapid,google/agi,Qining/gapid,Qining/gapid,google/agi,Qining/gapid,google/gapid,pmuetschard/gapid,pmuetschard/gapid,google/agi,pmuetschard/gapid,google/agi,pmuetschard/gapid,google/gapid,google/gapid,Qining/gapid,Qining/gapid,google/gapid,google/agi,Qining/gapid