Add getSizeBytes and cleanup docs.
Add getSizeBytes and cleanup docs.

Change-Id: I854a41f50378590b58bfbb205906ed4bee440411

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base