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Fixes https://github.com/flutter/flutter/issues/82973 Mouse scroll wheel support for android. I chose to not cache the vertical and horizontal scale factors that come from view configuration. The primary reason is that in the current code path context is only used when the user scrolls which was the unimplemented feature. This smaller blast radius I decided was worth the additional calls. A secondary reason is that when the scale factors are changed is not a well documented path nor is there a lifecycle callback to listen to. Scroll factor is cached on api 25 and below because that more closely mirrors the behavior I see in pre 25 versions of android scroll view. Note flutter takes longer to "see" a mouse that then scrolls than android Fixes #flutter/flutter/82973 Todo list prior to merge ## Links * Some pre api 26 scroll factor code - https://cs.android.com/android/platform/superproject/main/+/main:frameworks/base/core/java/android/view/View.java?q=function:getVerticalScrollFactor%20filepath:android%2Fview%2FView.java&ss=android%2Fplatform%2Fsuperproject%2Fmain - https://cs.android.com/android/_/android/platform/frameworks/base/+/main:core/java/android/widget/ScrollView.java;l=930;drc=2fe301db7555bccf53e465436d4cb7442c803df3;bpv=0;bpt=0 * Post api 26 scroll factor code - https://cs.android.com/android/_/android/platform/frameworks/base/+/main:core/java/android/widget/ScrollView.java;l=361;drc=406e0f655387f27dda874c2b975fb0ddbd61aa13;bpv=0;bpt=0 - https://developer.android.com/reference/android/view/ViewConfiguration#getScaledVerticalScrollFactor()