[Velocity Tracker] Fix: Issue 97761: Flutter Scrolling does not match iOS; inadvertent scrolling when user lifts up finger (#132291)

## Issue

**Issue:** https://github.com/flutter/flutter/issues/97761

https://github.com/flutter/flutter/assets/1863934/53c5e0df-b85a-483c-a17d-bddd18db3aa9

## The Cause:

The bug is very simple to understand - `velocity_tracker.dart` **only adds new samples while your finger is moving**.

**Therefore**, if you move your finger quickly & (important) stop suddenly with no extra movement, the last 3 samples will all be > 0 dy. Regardless of how long you wait, you will get movement when you lift up your finger.

**Logs from velocity_tracker.dart:**
Notice: all 3 `_previousVelocityAt` are `dy > 0` despite a 2 second delay since the last scroll
```
// start moving finger
flutter: addPosition dy:-464.0
flutter: addPosition dy:-465.0
flutter: addPosition dy:-466.0
flutter: addPosition dy:-467.0
flutter: addPosition dy:-468.0
flutter: addPosition dy:-469.0
flutter: addPosition dy:-470.0
// stop moving finger here, keep it still for 2 seconds & lift it up
flutter: _previousVelocityAt(-2) samples(-467.0, -468.0)) dy:-176.772140710624
flutter: _previousVelocityAt(-1) samples(-468.0, -469.0)) dy:-375.0937734433609
flutter: _previousVelocityAt(0) samples(-469.0, -470.0)) dy:-175.71604287471447
flutter: primaryVelocity DragEndDetails(Velocity(0.0, -305.5)).primaryVelocity
flutter: createBallisticSimulation pixels 464.16666666666663 velocity 305.4699824197211
```

## The Fix

**There are 3 options to fix it:**
A. sample uniformly *per unit time* (a larger more risky change, hurts battery life)
B. consider elapsed time since the last sample. If greater than X, assume no more velocity. (easy & just as valid)
C. similar to B, but instead add "ghost samples" of velocity zero, and run calculations as normal (a bit tricker, of dubious benefit imo)

**For Option B I considered two approaches:**
1. _get the current timestamp and compare to event timestamp._  This is tricky because events are documented to use an arbitrary timescale & I wasn't able to find the code that generates the timestamps. This approach could be considered more.
2. _get a new timestamp using Stopwatch and compare now vs when the last sample was added._ This is the solution implemented here.  There is a limitation in that we don't know when addSamples is called relative to the event. But, this estimation is already on a very low latency path & still it gives us a *minimum* time bound which is sufficient for comparison. 

**This PR chooses the simplest of the all solutions. Please try it our yourself, it completely solves the problem 😀** Option _B.1_ would be a nice alternative as well, if we can define and access the same timesource as the pointer tracker in a maintainable simple way.

## After Fix

https://github.com/flutter/flutter/assets/1863934/be50d8e7-d5da-495a-a4af-c71bc541cbe3

fixes https://github.com/flutter/flutter/issues/135144

https://github.com/flutter/engine/compare/2c4c1108aa87...1ae3d20332f0

2023-09-25 54558023+keyonghan@users.noreply.github.com Switch goma to reclient for Linux host engine targets (flutter/engine#45884)
2023-09-25 skia-flutter-autoroll@skia.org Roll Skia from 7a49397a02b4 to e16a9b5b2c48 (1 revision) (flutter/engine#46258)
2023-09-25 skia-flutter-autoroll@skia.org Roll Skia from 569a30fbdbdf to 7a49397a02b4 (2 revisions) (flutter/engine#46257)
2023-09-25 skia-flutter-autoroll@skia.org Roll Skia from 31ceb1669d1c to 569a30fbdbdf (1 revision) (flutter/engine#46256)

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https://github.com/flutter/packages/compare/98ebcd3d9c05...e548ae1d2045

2023-09-23 49699333+dependabot[bot]@users.noreply.github.com Bump github/codeql-action from 2.21.7 to 2.21.8 (flutter/packages#4952)
2023-09-23 engine-flutter-autoroll@skia.org Manual roll Flutter from 89365041 to f92884c7 (48 revisions) (flutter/packages#4985)
2023-09-22 geral.sbi2@gmail.com [image_picker_android] check if data from result is empty when picking a single img or video (flutter/packages#4836)
2023-09-22 me@nils.re [camera_android] Removes usage of `_ambiguate` method in tests (flutter/packages#4948)
2023-09-22 49699333+dependabot[bot]@users.noreply.github.com [sign_in]: Bump com.google.android.gms:play-services-auth from 20.6.0 to 20.7.0 in /packages/google_sign_in/google_sign_in_android/android (flutter/packages#4841)

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https://github.com/flutter/engine/compare/e6d3bac5c723...2c4c1108aa87

2023-09-25 49699333+dependabot[bot]@users.noreply.github.com Bump archive from 3.3.9 to 3.4.2 in /lib/web_ui (flutter/engine#46253)

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Reverts flutter/flutter#135372

https://github.com/flutter/engine/compare/e1c1022c2d6d...e6d3bac5c723

2023-09-25 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from VKAiabs4VzJ1Py-oA... to uY9WEf2tJxa1Hpp4v... (flutter/engine#46252)
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https://github.com/flutter/engine/compare/2daf5e7bb249...3ea1174ecfaa

2023-09-25 zanderso@users.noreply.github.com In run_tests.py, separate Dart package unit tests from other tests (flutter/engine#46232)
2023-09-24 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from SqWjDvrDsMfiisUoA... to VKAiabs4VzJ1Py-oA... (flutter/engine#46241)
2023-09-24 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from W1uZC0_FbXyoCmwJ1... to 0Jl20zAW45rRsTNEu... (flutter/engine#46240)
2023-09-24 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from M-fNM9YP2Lpc8Y_Dj... to SqWjDvrDsMfiisUoA... (flutter/engine#46239)

Also rolling transitive DEPS:
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Goden tests are easier to understand than `paints..` since the toolbar has a relatively complex path, and this should make PRs that make visual changes easier to review. 

The current goldens don't look correct since I messed up the y offset of the tip of the arrow when the arrow is pointing up. Should be fixed in https://github.com/flutter/flutter/pull/133386

Reverts flutter/flutter#135373

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2023-09-24 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from de4D1aoqF6LBk18Rd... to W1uZC0_FbXyoCmwJ1... (flutter/engine#46238)

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https://github.com/flutter/engine/compare/614859053262...ee27600dfbe2

2023-09-23 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from PCEkaltiQ-iEKlmEj... to M-fNM9YP2Lpc8Y_Dj... (flutter/engine#46231)

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https://github.com/flutter/engine/compare/564480337eae...614859053262

2023-09-23 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from M9rDyhmn7VY4iTxzQ... to de4D1aoqF6LBk18Rd... (flutter/engine#46229)
2023-09-23 ychris@google.com [ios] Fix default assets url (flutter/engine#46214)
2023-09-23 skia-flutter-autoroll@skia.org Roll Skia from 15ccdeaba011 to 983f42f4c76b (1 revision) (flutter/engine#46223)
2023-09-23 chillers@google.com Revert "[Impeller] fail if software backend is chosen and Impeller is enabled on iOS" (flutter/engine#46217)
2023-09-23 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from QcxgV9KlY7j3o3b4j... to PCEkaltiQ-iEKlmEj... (flutter/engine#46221)
2023-09-22 jonahwilliams@google.com [Impeller] dont treat non-rects as rects. (flutter/engine#46218)
2023-09-22 skia-flutter-autoroll@skia.org Roll Skia from e9358f92110c to 15ccdeaba011 (1 revision) (flutter/engine#46216)

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https://github.com/flutter/engine/compare/e4bfdc1a67de...564480337eae

2023-09-22 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from ZyajVWocCHVIuJkzM... to M9rDyhmn7VY4iTxzQ... (flutter/engine#46215)
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2023-09-22 skia-flutter-autoroll@skia.org Roll Skia from 78fced84372d to e9358f92110c (4 revisions) (flutter/engine#46211)
2023-09-22 bdero@google.com [Impeller] Incorporate backdrop filters in subpass coverage. (flutter/engine#46130)

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PlatformViews have been supported without a custom engine build on iOS
for quite some time now, and are nearing support for macOS. Adds a link
to the website documentation covering creation of PlatformViews for iOS
and adds a TODO to do the same once the macOS PlatformView documentation
is ready.

Related: https://github.com/flutter/website/issues/9424

This PR moves tests running on Pixel 7 Pro that use Skia from staging to prod.

Requested here: https://github.com/flutter/flutter/pull/133952#discussion_r1334860858

https://github.com/flutter/engine/compare/954ea95be336...e4bfdc1a67de

2023-09-22 skia-flutter-autoroll@skia.org Roll Skia from 8a1e6e5844d7 to 78fced84372d (4 revisions) (flutter/engine#46207)

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Movement in this metric is mostly noise, creates many false alerts, and is neither the cause nor effect of changes in other metrics.

https://github.com/flutter/engine/compare/92be04f73d5d...954ea95be336

2023-09-22 skia-flutter-autoroll@skia.org Roll Skia from fe73688dc40f to 8a1e6e5844d7 (1 revision) (flutter/engine#46205)
2023-09-22 jonahwilliams@google.com [Impeller] Reland: construct text frames on UI thread. (flutter/engine#46115)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC jonahwilliams@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md