Refine the latency and jank instrumentation of opening panel

We had two problems, the first one is that the latency instruemntation
overlapped with the jank instrumentation; the second one is that
the swipe / fling instrumentation might be ended too early and the
fling part was ignored.

Bug: 169221093
Bug: 176953201
Test: See the doc list in comment
Change-Id: I11937d02a3a05c82dd2526ae59ccd472f39309c7