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)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

* 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
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC franciscojma@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

* 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)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Please CC franciscojma@google.com on the revert to ensure that a human
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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

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
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC franciscojma@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

* 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
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC franciscojma@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 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
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC franciscojma@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 04ea3183.