Merge "Backport implementation of AltitudeConverter to T."

core/res/assets/geoid_height_map/README.md

core/res/assets/geoid_height_map/map-params.pb

core/res/assets/geoid_height_map/tile-1.pb

core/res/assets/geoid_height_map/tile-3.pb

core/res/assets/geoid_height_map/tile-5.pb

core/res/assets/geoid_height_map/tile-7.pb

core/res/assets/geoid_height_map/tile-9.pb

core/res/assets/geoid_height_map/tile-b.pb

core/res/geoid_height_map_assets/README.md

core/res/geoid_height_map_assets/map-params.textpb

core/res/geoid_height_map_assets/tile-1.textpb

core/res/geoid_height_map_assets/tile-3.textpb

core/res/geoid_height_map_assets/tile-5.textpb

core/res/geoid_height_map_assets/tile-7.textpb

core/res/geoid_height_map_assets/tile-9.textpb

core/res/geoid_height_map_assets/tile-b.textpb

location/java/android/location/Location.java

...ion/java/android/location/altitude/AltitudeConverter.java

...om/android/internal/location/altitude/GeoidHeightMap.java

...com/android/internal/location/altitude/S2CellIdUtils.java