LockPatternView: Combine all cell activation animations.

Combine dot radius, dot color, line disappearing, line end animations together. It helps to reduce inconsistent states when one animation is cancelled and another is still running.

Bug: 196067470
Change-Id: Ieac0bb3f329ac94924e3c5dd5a4a4e119404a56c
(cherry picked from commit f5436912207f512493270ee5a1824b89f792aea4)