The error message was misleading because BoxDecoration does not have a `backgroundColor` parameter. Instead it has a `color` parameter, which sets the background color. I also removed the optional `new` keyword.

https://github.com/flutter/engine/compare/c84fad959284...e0fe8342889c

git log c84fad959284..e0fe8342889c --first-parent --oneline
2020-01-16 skia-flutter-autoroll@skia.org Roll src/third_party/dart 515d4bd7adb1..009537bbf0ff (1 commits) (flutter/engine#15687)
2020-01-16 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from UlOSN... to YPYqb... (flutter/engine#15689)


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https://github.com/flutter/engine/compare/8c855dba98eb...c84fad959284

git log 8c855dba98eb..c84fad959284 --first-parent --oneline
2020-01-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 7edb0eb8a458..2900040bc4a0 (3 commits) (flutter/engine#15686)
2020-01-16 skia-flutter-autoroll@skia.org Roll src/third_party/dart 862d5012ae9c..515d4bd7adb1 (18 commits) (flutter/engine#15683)
2020-01-16 skia-flutter-autoroll@skia.org Roll src/third_party/skia 7655168e6865..7edb0eb8a458 (16 commits) (flutter/engine#15682)
2020-01-15 vsm@google.com [web] update dart:js and dart:js_util to new upstream locations (flutter/engine#15681)


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Step 2 of 2: Remove Flutter's FloatingActionButton dependency on ThemeData accent properties (#46923)

https://github.com/flutter/engine/compare/09d892b3bf5d...8c855dba98eb

git log 09d892b3bf5d..8c855dba98eb --first-parent --oneline
2020-01-15 yjbanov@google.com fix text blurriness in HTML-rendered text (flutter/engine#15649)


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https://github.com/flutter/engine/compare/be20fb661a69...09d892b3bf5d

git log be20fb661a69..09d892b3bf5d --first-parent --oneline
2020-01-15 mouad.debbar@gmail.com [web] Freeze window.defaultRouteName (flutter/engine#15565)
2020-01-15 hterkelsen@users.noreply.github.com Upgrade to CanvasKit 0.11 (flutter/engine#15677)


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https://github.com/flutter/engine/compare/348805107fe1...be20fb661a69

git log 348805107fe1..be20fb661a69 --first-parent --oneline
2020-01-15 nurhan@google.com [web] Exec command copy (flutter/engine#15675)
2020-01-15 chinmaygarde@google.com Disable fml_unittests till flakes are addressed. (flutter/engine#15676)
2020-01-15 skia-flutter-autoroll@skia.org Roll src/third_party/dart fe666ce592cb..862d5012ae9c (48 commits) (flutter/engine#15672)
2020-01-15 gspencergoog@users.noreply.github.com Fix hardware keyboard enter so it triggers an action. (flutter/engine#15568)
2020-01-15 tan@jayjun.com Use iOS 13 dark content status bar style (flutter/engine#13119)
2020-01-15 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from oxHfW... to UlOSN... (flutter/engine#15670)
2020-01-15 skia-flutter-autoroll@skia.org Roll src/third_party/skia e45c5cd03eeb..7655168e6865 (29 commits) (flutter/engine#15671)
2020-01-15 daniel.nicoara@gmail.com Fix embedder mutation order (flutter/engine#15566)


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[flutter_tools] Handle special characters during conversion of asset manifest paths into URIs (#48829)

https://github.com/flutter/engine/compare/bc41ab513932...348805107fe1

git log bc41ab513932..348805107fe1 --first-parent --oneline
2020-01-15 cyriln@google.com Add --lazy_async_stacks to the set of whitelisted VM flags. (flutter/engine#15602)
2020-01-15 dnfield@google.com try 10 times (flutter/engine#15653)


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https://github.com/flutter/engine/compare/ddaa9dc95f7b...bc41ab513932

git log ddaa9dc95f7b..bc41ab513932 --first-parent --oneline
2020-01-15 nurhan@google.com [web] Add Edge support for Flutter Engine unit-tests. (flutter/engine#15641)
2020-01-14 garyq@google.com Add FML_DCHECK to ensure layout before calling getters (flutter/engine#15635)


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https://github.com/flutter/engine/compare/82a851cf21cf...ddaa9dc95f7b

git log 82a851cf21cf..ddaa9dc95f7b --first-parent --oneline
2020-01-14 bkonyi@google.com Add back sky_engine/LICENSE (flutter/engine#15631)
2020-01-14 skia-flutter-autoroll@skia.org Roll src/third_party/skia 69ace2a0adbe..e45c5cd03eeb (23 commits) (flutter/engine#15584)


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https://github.com/flutter/engine/compare/fd269f60bfc6...82a851cf21cf

git log fd269f60bfc6..82a851cf21cf --first-parent --oneline
2020-01-14 bkonyi@google.com Roll src/third_party/dart 83fba7bd54..fe666ce592 (3 commits) (flutter/engine#15619)
2020-01-14 stuartmorgan@google.com Implement HWND access for Windows plugins (flutter/engine#15378)


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This reverts commit d5b0b3c8.

dev_finder name is deprecated. device-finder is preferred.
Functionality remains identical, this is an aesthetic change.

This change was generated via:
$ find . -not -path '*/\.*' -type f -exec sed -i 's/(^import.*)!dev_finder/device-finder/g' {} \;

* Reland: [flutter_tools] File system utilities

* Remove unused imports