This CL adds following APIs
Font#cloneWithSettings
This API provides a faster Font instance creation for different
variation settings.
Font#getBounds
This API provides glyph advance and bounding box information.
Font#getMetrics
This API provides font metrics that will be used for deciding line
height and/or baseline.
Bug: 168136332
Test: atest FontTest
Test: TreeHugger
Change-Id: I335557ce47ea0ca8e012c2a48b804c00bb348392
1ed4f6441f