Merge "Introduce FontStyle for future extensibility"

api/current.txt

core/java/android/text/style/TextAppearanceSpan.java

core/java/android/widget/TextView.java

graphics/java/android/graphics/Typeface.java

graphics/java/android/graphics/fonts/Font.java

graphics/java/android/graphics/fonts/FontFamily.java

graphics/java/android/graphics/fonts/FontStyle.java

graphics/java/android/graphics/fonts/SystemFonts.java