Tune cast_shell scroll fling.

Modifies the acknowledged fudge factor for more pleasant scrolling.
Also adds subdirectory OWNERS for facilitating future fudging.

Bug: b/77490018
Test: on device
Change-Id: Id60ad0d1326dfb7c3e42be22b99cc20021a32c28
Reviewed-on: https://chromium-review.googlesource.com/996132Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Kevin Schoedel <kpschoedel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548160}

ui/events/chromecast/OWNERS

+alexst@chromium.org
+kpschoedel@chromium.org
+rdaum@chromium.org
+spang@chromium.org

ui/events/chromecast/scroller.cc

@@ -186,7 +186,7 @@ Scroller::Scroller(const Config& config)
       distance_(0),
       fling_friction_(config.fling_friction),
       deceleration_(ComputeDeceleration(fling_friction_)),
-      tuning_coeff_(ComputeDeceleration(0.84f)) {
+      tuning_coeff_(ComputeDeceleration(3.25f)) {
 }
 
 Scroller::~Scroller() {