Makes dragging window magnification smoother on low-medium device

It takes some time to update the geometry of the mirror window of
window magnification. If the peformance of the device is not so
good, the dragging of window magnification would looks sluggish.
To improve this, we use Choreographer to update the mirror view
geometry. It make the refresh rate sync with display frame
rendering.

Bug: 158264842
Test: atest WindowMagnificationControllerTest
Change-Id: Ia2eaca85ccec90b735dab9114c58a94108cdbed1