Bound the maximum touchscreen fling velocity.

ui/base/gestures/gesture_sequence.cc

Index: ui/base/gestures/gesture_sequence.cc
diff --git a/ui/base/gestures/gesture_sequence.cc b/ui/base/gestures/gesture_sequence.cc
index 115229ab71a4c71069272d4239656878e0e836f1..07d42eda3f74e8e4ea95ac081e387cdb67aea8e0 100644
--- a/ui/base/gestures/gesture_sequence.cc
+++ b/ui/base/gestures/gesture_sequence.cc
@@ -296,7 +296,10 @@ float CalibrateFlingVelocity(float velocity) {
     nu += x * a;
     x *= normalized_velocity;
   }
-  return nu * velocity;
+  if (velocity < 0.f)
+    return std::max(nu * velocity, -GestureConfiguration::fling_velocity_cap());
+  else
+    return std::min(nu * velocity, GestureConfiguration::fling_velocity_cap());
 }
 
 }  // namespace