BatteryProperty: Add battery capacity property
BatteryProperty: Add battery capacity property

Match change in native code
  https://googleplex-android-review.git.corp.google.com/#/c/427553/

Change-Id: I0049ccbbef59fbbc0e14b50b9af7481d87a6d48c
xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base