MediaQueryData.toString() omitted commas and spaces around some
properties, making the output difficult to read.

This is the correct metric to report for compilation time benchmarks rather
than RunTime. Rename the 'gen_snapshot' value to merely 'snapshot' for
backwards compatibility and overall simplicity.

This change simplifies Dart's benchmarking of Flutter by making it easier to
adopt --report-timings (made for Dart to use), which makes the benchmarks
much more robust.

bc3bd709c Roll src/third_party/skia 4dfbc9e68528..2f9297dff115 (4 commits) (flutter/engine#8812) (#31973)


https://github.com/flutter/engine/compare/496fd3acb57a...bc3bd709c7f9

git log 496fd3acb57ab97f9b83b35d22636ee67bf2b5b2..bc3bd709c7f9ef099485f85c30d108707b89107e --no-merges --oneline
bc3bd709c Roll src/third_party/skia 4dfbc9e68528..2f9297dff115 (4 commits) (flutter/engine#8812)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (amirha@google.com), and stop
the roller if necessary.

496fd3acb Roll src/third_party/skia 7cf4242f8adf..4dfbc9e68528 (1 commits) (flutter/engine#8809) (#31963)


https://github.com/flutter/engine/compare/ce9e9ba7e4a6...496fd3acb57a

git log ce9e9ba7e4a6e94adc5c60c809410515b9a00324..496fd3acb57ab97f9b83b35d22636ee67bf2b5b2 --no-merges --oneline
496fd3acb Roll src/third_party/skia 7cf4242f8adf..4dfbc9e68528 (1 commits) (flutter/engine#8809)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

- Added docs to AppBar to cover AppBar's inherited MediaQuery when not used in a Scaffold in general
- s/Hero]s/Hero]es/

https://github.com/flutter/engine/compare/beeb56b43dc8...ce9e9ba7e4a6

git log beeb56b43dc87d742852fb4a08f2b71dd4e79ece..ce9e9ba7e4a6e94adc5c60c809410515b9a00324 --no-merges --oneline
ce9e9ba7e Roll src/third_party/skia 35ea04d61370..7cf4242f8adf (2 commits) (flutter/engine#8807)
d909b4d44 Roll buildroot to pick up updated tools/dart/create_updated_flutter_deps.py (flutter/engine#8804)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/6280d4266983...beeb56b43dc8

git log 6280d4266983ff8eff24f26164d10172e3824385..beeb56b43dc87d742852fb4a08f2b71dd4e79ece --no-merges --oneline
beeb56b43 Roll src/third_party/skia 6db27c28c61e..35ea04d61370 (8 commits) (flutter/engine#8803)
e5305f422 Roll src/third_party/skia 6c8f5b31ac49..6db27c28c61e (4 commits) (flutter/engine#8802)
ed7d128d7 Reformat dart dependencies in DEPS. (flutter/engine#8800)
ed912a01d Roll src/third_party/dart 5fbf7720f8..b6997deb3e (26 commits)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

* Add horizontal padding and properly constrain chip label calculations

* Added regression test for avatar, label and delete icon constraint

In #31614, I added an unfocus() to FocusNodes to allow giving up of focus, but it only worked on the primary focus. This changes that so that it will unfocus the entire chain, not just the primary focus. Now, if you call unfocus() on a FocusNode or FocusScopeNode, and their hasFocus returns true, then after calling unfocus(), it will return false. Before this change, it would only do that if hasPrimaryFocus was also true.

This also fixes a bug in the way setFirstFocus was implemented, making it conform more to the behavior of the previous implementation. It has simplified logic in reparent, and in when it requests focus for scope nodes that have had setFirstFocus called on them.

Make FlutterError objects more structured so they can be displayed better in debugging tools such as Dart DevTools.

https://github.com/flutter/engine/compare/8768180a8871...6280d4266983

git log 8768180a8871ede2af9d483d764109b92df6faf9..6280d4266983ff8eff24f26164d10172e3824385 --no-merges --oneline
6280d4266 Dart SDK roll for 2019-04-30 (flutter/engine#8796)
c67870cfd Roll src/third_party/skia 08c79d61450b..6c8f5b31ac49 (4 commits) (flutter/engine#8799)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

* Introduce BottomSheetTheme and shape support for bottom sheet

* Add bottom sheet theme to ThemeData. Use theme in bottom sheet build

* Expose color, elevation, shape to showModalBottomSheet helper

* Expose color, elevation, shape to showBottomSheet helper

* Address PR feedback

* Address PR feedback

* Address additional PR feedback

This reverts commit fea2c7d6.

8768180a8 Roll src/third_party/skia e6a83e160860..08c79d61450b (1 commits) (flutter/engine#8797) (#31887)


https://github.com/flutter/engine/compare/2f11d3c4a205...8768180a8871

git log 2f11d3c4a205eca899de19617303ca8174ada7e3..8768180a8871ede2af9d483d764109b92df6faf9 --no-merges --oneline
8768180a8 Roll src/third_party/skia e6a83e160860..08c79d61450b (1 commits) (flutter/engine#8797)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

Show appropriate error message when fonts isn't iterable

This reverts commit c0d5fd23.

https://github.com/flutter/engine/compare/f2d21795be43...2f11d3c4a205

git log f2d21795be43aa4f596b75668b772a97af3888a9..2f11d3c4a205eca899de19617303ca8174ada7e3 --no-merges --oneline
2f11d3c4a Roll src/third_party/skia f808c5e3afa3..e6a83e160860 (3 commits) (flutter/engine#8795)
1219e5c7d Re-create texture from pixel buffer onGrContextCreate (flutter/engine#8792)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/59b91392e20a...f2d21795be43

git log 59b91392e20ac6b397bb4e257dc08333c54658c9..f2d21795be43aa4f596b75668b772a97af3888a9 --no-merges --oneline
f2d21795b Roll buildroot to pull in Fuchsia SDK related updates. (flutter/engine#8793)
5e5705000 Roll src/third_party/skia 836ff5e40560..f808c5e3afa3 (11 commits) (flutter/engine#8791)
5a9e87457 Roll src/third_party/skia 494aa3db9e78..836ff5e40560 (2 commits) (flutter/engine#8788)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

* Allow DSS to be dragged when its children do not fill extent

* Fix when maxChildSize  < 1.0