[$] Scheduling for the Android display pipeline

Android users make heavy use of the displays on their devices for almostall of their interaction; good display performance is thus critical for asatisfactory user experience. Achieving that performance is not alwayseasy; there are a lot of pieces that need to work together, and the kerneldoes not always support this collaboration as well as one might like. TheAndroid team is currently considering a number of combinations of existingkernel features and possible enhancements in its efforts to provide thebest display experience possible.