This adds a visualDensity attribute to checkbox, radio, icon button, and chip.

This fixes an issue where lines like this:

    focusNode.canRequestFocus = widget.canRequestFocus ?? focusNode.canRequestFocus;

Were causing the canRequestFocus bit to copy the status of the enclosing scope, since canRequestFocus also looks to the enclosing scope to decide if it can focus.

git@github.com:flutter/engine.git/compare/fdaa7cf12175...ee4c2a53c7c6

git log fdaa7cf12175..ee4c2a53c7c6 --first-parent --oneline
2019-12-05 skia-flutter-autoroll@skia.org Roll src/third_party/skia 6344c2937997..0af32fdf5fea (12 commits) (#14139)
2019-12-05 dworsham@google.com Wire up Opacity on Fuchsia, round 2 (#14024)
2019-12-05 gw280@google.com Disable fml_tests until they're fixed on Fuchsia (#14137)
2019-12-05 30870216+gaaclarke@users.noreply.github.com Started specifying the OS version for running the tests. (#14094)
2019-12-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia ccca30aad770..6344c2937997 (13 commits) (#14133)
2019-12-04 30870216+gaaclarke@users.noreply.github.com Expanded our scenario_app docs. (#14136)
2019-12-04 yjbanov@google.com [web][felt] fix source map path (#14134)
2019-12-04 chinmaygarde@google.com Fix platform view offsets incorrectly taking into account device pixel ratios. (#14135)


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/fdaa7cf12175...ee4c2a53c7c6

git log fdaa7cf12175..ee4c2a53c7c6 --first-parent --oneline
2019-12-05 skia-flutter-autoroll@skia.org Roll src/third_party/skia 6344c2937997..0af32fdf5fea (12 commits) (#14139)
2019-12-05 dworsham@google.com Wire up Opacity on Fuchsia, round 2 (#14024)
2019-12-05 gw280@google.com Disable fml_tests until they're fixed on Fuchsia (#14137)
2019-12-05 30870216+gaaclarke@users.noreply.github.com Started specifying the OS version for running the tests. (#14094)
2019-12-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia ccca30aad770..6344c2937997 (13 commits) (#14133)
2019-12-04 30870216+gaaclarke@users.noreply.github.com Expanded our scenario_app docs. (#14136)
2019-12-04 yjbanov@google.com [web][felt] fix source map path (#14134)
2019-12-04 chinmaygarde@google.com Fix platform view offsets incorrectly taking into account device pixel ratios. (#14135)

This adds support to PlatformViewLayer for handling hover events. Prior
to this, PlatformViewLayers only supported events forwarded by the
gesture recognizers associated with the PlatformViewRenderBox. Hover
events don't participate in gesture recognition and as such are dropped
in GestureBinding. That said, hover event processing in platform views
is expected for desktop and other platforms with hover event support.

This adds support for passing an optional MouseTrackerAnnotation to
PlatformViewLayer. PlatformViewRenderBox populates this with a mouse
tracker annotation that forwards hover events to
PlatformViewController.dispatchPointerEvent() for handling by users.

Introduced LargeImageHandler to ImageCache class.

This normalizes all of the "See also" blocks in comments so that they conform in style.

They all look like this now:

  /// See also:
  ///
  ///  * [MyFavoriteWidget], because it's cool.
  class Foo {}

I removed some useless "See also" blocks, and added commentary to ones that were just "bare" references.

This is my penance for adding so many bullets that are "-" instead of "*". :-)

This reverts commit 2a113165.

This adds actions and shortcuts arguments to WidgetsApp (and MaterialApp and CupertinoApp) to allow developers to override the default mappings on an application, and to allow for a more complex definition of the default mappings.

I've stopped using SelectAction here, in favor of using ActivateAction for all activations, but haven't removed it, to avoid a breaking change, and to allow a common base class for these types of actions. This is because some platforms use the same mapping (web) for both kinds of activations (both select and activate).

git@github.com:flutter/engine.git/compare/07aab98212cb...fdaa7cf12175

git log 07aab98212cb..fdaa7cf12175 --first-parent --oneline
2019-12-04 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from OSk8h... to XCAOU... (#14128)
2019-12-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia 75368c3a0290..ccca30aad770 (12 commits) (#14129)


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

Adds a manual test that allows testing of density for buttons. Also updates some of the button tests to be somewhat simpler and to test the child positions in the test to make sure they are consistent.

git@github.com:flutter/engine.git/compare/1cdfc99314df...07aab98212cb

git log 1cdfc99314df..07aab98212cb --first-parent --oneline
2019-12-04 brianosman@google.com Fix one more use of deprecated path fill type API (#14127)


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

* Api Samples and Diagrams for the following classes and methods:

  - AlertDialog
  - SimpleDialog
  - SingleChildScrollView
  - showDatePicker
  - RichText
  - InputDecoration
  - Divider
  - StreamBuilder
  - DataTable
  - BottomSheet
    - showBottomSheet
    - showModalBottomSheet

* Update packages/flutter/lib/src/material/divider.dart
Co-Authored-By: Kate Lovett <katelovett@google.com>

* Update packages/flutter/lib/src/widgets/basic.dart
Co-Authored-By: Kate Lovett <katelovett@google.com>

* Update packages/flutter/lib/src/material/data_table.dart
Co-Authored-By: Kate Lovett <katelovett@google.com>

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-Authored-By: Kate Lovett <katelovett@google.com>

* Update packages/flutter/lib/src/material/scaffold.dart
Co-Authored-By: Kate Lovett <katelovett@google.com>

* Move animation out of sample

* Remove "widget.size", replace with "60"

* implicit-casts:false in flutter_driver

* address review comments

* implicit-casts:false in flutter/lib/src/rendering

* address review comments

* implicit-casts:false in flutter/lib/src/widgets

* address review comments

* address review comment

1cdfc9931 Roll src/third_party/dart 19fc1016da..2a13b1fe26 (6 commits) (flutter/engine#14107) (#46059)


git@github.com:flutter/engine.git/compare/3e6d6bc612fd...1cdfc99314df

git log 3e6d6bc612fd..1cdfc99314df --first-parent --oneline
2019-12-04 bkonyi@google.com Roll src/third_party/dart 19fc1016da..2a13b1fe26 (6 commits) (#14107)


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/90e28c027c0b...3e6d6bc612fd

git log 90e28c027c0b..3e6d6bc612fd --first-parent --oneline
2019-12-04 47866232+chunhtai@users.noreply.github.com add pointer data santizing in flutter web engine (#14082)


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