Add per glyph filter for tweaking glyph positions for animation

Bug: 199051139
Test: atst TextAnimatorTest TextInterpolatorTest
Change-Id: I721860b78496e9a272b086c246ce0781e3fdc37f
(cherry picked from commit b0080f9402d9e0d61603b1d7b4465920f1f9f84b)
Merged-In: I721860b78496e9a272b086c246ce0781e3fdc37f
4 files changed