1) Factors InkWell out of Material so that components can use an ink well
without needing the shadow/level machinery.
2) Makes the ink effect move at a different velocity once the tap has actually
occurred, converging with the spec. We don't have the right speeds yet, but
at least we're approaching the right shape.
3) To support (2), added a primaryPointer attribute to GestureEvents to let
authors coorelate gesturetapdown events with later gesturetap events.
4) To support (2), modernized SplashAnimation to used AnimatedValue and friends.
5) Added more constants to view-configuration.dart that match Android.
I've also removed the cancelling of the ink effect on scroll. The proper way to
do that is to notice that someone in the event chain is listening for
scrollstart and delay the beginning of the ink effect for some period of time.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/1019023003
This is not complete gesture support by far, but it's a start.
MojoShell and Chrome use a C++ GestureDetector, this code attempts
to use the Android (Java) GestureDetector instead.
We probably should not be sending gesturetap until we've decided
it's not a scroll, etc, but this implementation does not go that far.
I had to fix a bug whereby we were assuming the InputEvent.time_stamp
was in TimeDelta's internal format, which was wrong. When we get
time_stamp from Android its in ms since boot.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/969493002
