More efficient drawing during animation

More efficient drawing during animation

- Improved mode options animation and video capture animation

- Changed the drawPath() calls to drawCircle() as drawing oval is
generally optimized and therefore more efficient. The efficiency
gained depends on the hardware/software specific implementation,
depending on where it's rendered. But drawCircle() should always
no more costly than drawPath().

- Move the video capture button animation to after MediaRecorder
initialization/release to avoid animation being blocked by time
consuming operations.

Bug: 13589320
Change-Id: I9c01374e46d439e33a066cfba07d95749a3caebf