Merge "Memtrack HAL: Update documentation"

 * GL, graphics, etc. All memory sizes must be in real memory usage,

 * accounting for stride, bit depth, rounding up to page size, etc.

 *

 * The following getMemory() categories are important for memory accounting in

 * `dumpsys meminfo` and should be reported as described below:

 *

 * - MemtrackType::GRAPHICS and MemtrackRecord::FLAG_SMAPS_UNACCOUNTED

 *     This should report the PSS of all DMA buffers mapped by the process

 *     with the specified PID. This PSS can be calculated using ReadDmaBufPss()

 *     form libdmabufinfo.

 *

 * - MemtrackType::GL and MemtrackRecord::FLAG_SMAPS_UNACCOUNTED

 *     This category should report all GPU private allocations for the specified

 *     PID that are not accounted in /proc/<pid>/smaps.

 *

 * - MemtrackType::OTHER and MemtrackRecord::FLAG_SMAPS_UNACCOUNTED

 *     Any other memory not accounted for in /proc/<pid>/smaps if any, otherwise

 *     this should return 0.

 *

 * Constructor for the interface should be used to perform memtrack management

 * setup actions and must be called once before any calls to getMemory().

 */

     * This information is used to identify GPU devices for GPU specific

     * memory accounting (e.g. DMA buffer usage).

     *

     * The device name(s) provided in getGpuDeviceInfo() must match the

     * device name in the corresponding device(s) sysfs entry.

     *

     * @return vector of DeviceInfo populated for all GPU devices.

     */

    DeviceInfo[] getGpuDeviceInfo();