recomputing the path context in the getter violates flutter repo style guide and adds a small but measurable overhead to all path operations

`showCheckboxColumn` will determine whether or not selectable rows in
DateTable or PaginatedDataTable will contain a leading CheckBox.

https://github.com/flutter/engine/compare/cbdc7bde224c...3851981b863a

git log cbdc7bde224c..3851981b863a --first-parent --oneline
2020-01-04 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from Vk6uT... to Kom_K... (flutter/engine#15142)


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* add key to constructors of public widgets

* fix a test

* fix a test

cbdc7bde2 Roll src/third_party/skia 7ac038f302f2..6791ee2f8059 (20 commits) (flutter/engine#15141) (#48163)


https://github.com/flutter/engine/compare/eb139936eb2c...cbdc7bde224c

git log eb139936eb2c..cbdc7bde224c --first-parent --oneline
2020-01-04 skia-flutter-autoroll@skia.org Roll src/third_party/skia 7ac038f302f2..6791ee2f8059 (20 commits) (flutter/engine#15141)


If this roll has caused a breakage, revert this CL and stop the roller
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* Added docs on how to set drawer to open only programmatically

https://github.com/flutter/engine/compare/5858519139c2...eb139936eb2c

git log 5858519139c2..eb139936eb2c --first-parent --oneline
2020-01-03 mouad.debbar@gmail.com [web] Fix right click issues (flutter/engine#15103)


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https://github.com/flutter/engine/compare/d35a4b300877...5858519139c2

git log d35a4b300877..5858519139c2 --first-parent --oneline
2020-01-03 skia-flutter-autoroll@skia.org Roll src/third_party/dart 05e70d5b38cb..2f57602411b3 (44 commits) (flutter/engine#15100)
2020-01-03 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from AVtRQ... to MwGkB... (flutter/engine#15110)
2020-01-03 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from zkzoZ... to Vk6uT... (flutter/engine#15104)


If this roll has caused a breakage, revert this CL and stop the roller
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To report a problem with the AutoRoller itself, please file a bug:
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* Implement AlertDialog.actionsPadding and AlertDialog.buttonPadding

https://github.com/flutter/engine/compare/fa05d367add3...d35a4b300877

git log fa05d367add3..d35a4b300877 --first-parent --oneline
2020-01-03 skia-flutter-autoroll@skia.org Roll src/third_party/skia 107c66669d37..7ac038f302f2 (30 commits) (flutter/engine#15102)
2020-01-02 skia-flutter-autoroll@skia.org Roll src/third_party/dart b52d264f5b2f..05e70d5b38cb (17 commits) (flutter/engine#15085)
2020-01-02 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from iImpF... to zkzoZ... (flutter/engine#15086)
2020-01-02 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from sxapd... to AVtRQ... (flutter/engine#15083)


If this roll has caused a breakage, revert this CL and stop the roller
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This reverts commit e46671f3.

https://github.com/flutter/engine/compare/bdc9708d235e...fa05d367add3

git log bdc9708d235e..fa05d367add3 --first-parent --oneline
2020-01-02 skia-flutter-autoroll@skia.org Roll src/third_party/skia c65d0069ec56..107c66669d37 (4 commits) (flutter/engine#15088)
2019-12-30 skia-flutter-autoroll@skia.org Roll src/third_party/skia 7c095dc67ce6..c65d0069ec56 (9 commits) (flutter/engine#15084)
2019-12-30 skia-flutter-autoroll@skia.org Roll src/third_party/skia 5a2f962313a5..7c095dc67ce6 (6 commits) (flutter/engine#15067)
2019-12-28 skia-flutter-autoroll@skia.org Roll src/third_party/dart c547f5d933e5..b52d264f5b2f (19 commits) (flutter/engine#14827)


If this roll has caused a breakage, revert this CL and stop the roller
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This reverts commit 04ea3183.

This reverts commit e768c92f.

* Update packages.

* Add many more global analyses.

* Catch trailing spaces and trailing newlines in all text files.
  Before we were only checking newly added files, but that means we
  missed some.

* Port the trailing spaces logic to work on Windows too.

* Correct all the files with trailing spaces and newlines.

* Refactor some of the dev/bots logic into a utils.dart library.
  Notably, the "exit" and "print" shims for testing are now usable
  from test.dart, analyze.dart, and run_command.dart.

* Add an "exitWithError" function that prints the red lines and
  then exits. This is the preferred way to exit from test.dart,
  analyze.dart, and run_command.dart.

* More consistency in the output of analyze.dart.

* Refactor analyze.dart to use the _allFiles file enumerating logic
  more widely.

* Add some double-checking logic to the _allFiles logic to catch
  cases where changes to that logic end up catching fewer files
  than expected (helps prevent future false positives).

* Add a check to prevent new binary files from being added to
  the repository. Grandfather in the binaries that we've already
  added.

* Update all the dependencies (needed because we now import crypto in
  dev/bots/analyze.dart).

This reverts commit 659dc812.

* Add preferred-supported-locales option to gen_l10n.dart executable