Merge "Document the default alignment and padding value." into sc-dev am: 91f691ec

 * total size of the writable region of the output data, and padding specifies the extra bytes at

 * the end of the memory region that may be used by the device to access memory in chunks, for

 * efficiency, but must not be used to hold any output data.

 *

 * When used in RequestArgument, clients should prefer to align and pad the sub-region to

 * 64 bytes when possible; this may allow the device to access the sub-region more efficiently.

 * The sub-region is aligned to 64 bytes if the value of offset is a multiple of 64.

 * The sub-region is padded to 64 bytes if the sum of length and padding is a multiple of 64.

 */

@VintfStability

parcelable DataLocation {