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It was done by WMS#startFreezingDisplay~stopFreezingDisplayLocked.
The duration is measured from rotation change to start animation.
Add a remote callback to know when the rotation animation is started.
So WM core can have the paired begin/end of trace that matches the
latency exactly.
The added ITransitionMetricsReporter is available for any processes.
So in the future it can also report the metrics from remote animator.
This change focuses on the rotation animation handled by shell.
Bug: 199836343
Test: adb shell setprop persist.debug.shell_transit 1; reboot
Rotate display and check trace "L<ACTION_ROTATE_SCREEN>".
Change-Id: I180d2fe1a77e98b6427ba831a2db2593739376bd
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