This is a follow-on to #45455 - the test failures indicated a
real problem, so re-enabling the tests on non-master.

https://github.com/flutter/flutter/issues/45453

* Add a density attribute to ThemeData

* Simplify tests

* Review changes (Hans)

git@github.com:flutter/engine.git/compare/617938024315...90e28c027c0b

git log 617938024315..90e28c027c0b --first-parent --oneline
2019-12-04 bkonyi@google.com Roll src/third_party/dart 89e31069e8..19fc1016da (6 commits) (#14093)
2019-12-03 dworsham@google.com Relanding: Add Flow unittests and fixtures (#14091)
2019-12-03 bkonyi@google.com Roll src/third_party/dart a4d799c402..89e31069e8 (14 commits) (#14089)


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 chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

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/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/1a96087747ac...617938024315

git log 1a96087747ac..617938024315 --first-parent --oneline
2019-12-03 caseyhillers@gmail.com Update fallback to Roboto url to be HTTPS (#14086)
2019-12-03 iska.kaushik@gmail.com Revert "Fix fml_unittests (#14062)" (#14087)
2019-12-03 liyuqian@google.com Revert PRs to unblock David and Jim's work (#14088)
2019-12-03 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from 6QxEZ... to OSk8h... (#14085)
2019-12-03 bkonyi@google.com Roll src/third_party/dart e4344a568f..a4d799c402 (7 commits) (#14083)


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 chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

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/+/master/autoroll/README.md

* Simplify logging code in flutter_driver

It appears nobody is benefitting from this logic, so we may as well not pay the cost.

* Make all of the driver interface public.

This is the second attempt at this; it should be better than before because the Logger interface, which conflicted in various places, no longer exists.

See #45733 for original attempt.

This reverts commit 0ce9206e (PR #45924).

Update for recent changes to policies.

git@github.com:flutter/engine.git/compare/faa11214c09b...1a96087747ac

git log faa11214c09b..1a96087747ac --first-parent --oneline
2019-12-03 brianosman@google.com Update to newer path fill-type API in Skia (#14070)


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 chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

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/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/8672e79af873...faa11214c09b

git log 8672e79af873..faa11214c09b --first-parent --oneline
2019-12-03 liyuqian@google.com Run benchmarks in Cirrus (#13950)
2019-12-03 stuartmorgan@google.com Report backing store changes in the macOS view (#13933)
2019-12-03 franciscojma@google.com Listen to keyUp event on meta modified keys (#13984)
2019-12-02 dnfield@google.com Fix live region logic (#14081)
2019-12-02 skia-flutter-autoroll@skia.org Roll src/third_party/skia e8c96d8e6116..2792515dab7c (1 commits) (#14069)
2019-12-02 bkonyi@google.com Roll src/third_party/dart 3f32196958..e4344a568f (1 commits) (#14073)
2019-12-02 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from aVdHP... to 6QxEZ... (#14080)


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 chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

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/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/6c605f8a9624...8672e79af873

git log 6c605f8a9624..8672e79af873 --first-parent --oneline
2019-11-28 skia-flutter-autoroll@skia.org Roll src/third_party/skia c96f5108df28..73beaaa48fcc (2 commits) (#14065)
2019-11-28 hterkelsen@users.noreply.github.com Fallback to Roboto if no suitable font is found (#14061)


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 cbracken@google.com on the revert to ensure that a human
is aware of the problem.

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/+/master/autoroll/README.md

This reverts commit 3b2042a0.

We added support linux VMs to devicelab and we will be moving some of
the machine independent benchmarks there.

This fixes some minor things I noticed while doing another change.

- Uncomments an old test that wants to be run, but can't be, and marked it as "skipped", so that the code won't rot anymore.
- Added the focus state to the short string version of a FocusNode
- Added a missing piece of information to findAncestorWidgetOfExactType

This reverts commit f2445002.

This reverts commit c59151b1.

This PR rewrites MouseTracker's lifecycle, so that mouse callbacks are all triggered in post frame, instead of the current one where some are triggered during the build phase. This PR also changes the onExit callback to MouseRegion, RenderMouseRegion, and MouseTrackerAnnotation, so that it is no longer triggered on dispose.

* [flutter_driver] [fuchsia] Validate existance of cmx for driver tests

Also added an example driver test that can run on Fuchsia devices.

Fixes: https://github.com/flutter/flutter/issues/45624

* update packages for stock example

* fix licenses