Fix error in `DefaultTabController.of` documentation
Co-authored-by: Shi-Hao Hong <shihaohong@google.com>

https://github.com/flutter/engine/compare/33813929e3cd...42bb7c9eea9a

git log 33813929e3cd..42bb7c9eea9a --first-parent --oneline
2019-12-20 50856934+nturgut@users.noreply.github.com [web] fix leaking problem in tests for text editing. (flutter/engine#14582)
2019-12-20 skia-flutter-autoroll@skia.org Roll src/third_party/dart 886615d0f95b..c260e4e8dac6 (15 commits) (flutter/engine#14601)
2019-12-20 skia-flutter-autoroll@skia.org Roll src/third_party/skia 088913a63b7e..28b0c5d4b3bb (17 commits) (flutter/engine#14600)


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 jsimmons@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

* Revert "Add visual density to the gallery options (#46090)"

This reverts commit 924efae9.

* Revert "fix analysis (#47594)"

This reverts commit 49c78459.

Adds the `iconMargin` parameter to Tab

This reverts commit cc1c9649.

This PR adds an option to the gallery options that sets the visual density to one of "standard" (the default), "comfortable", or "compact".

Revert "Check Xcode build setting FULL_PRODUCT_NAME for the name of the built app during flutter run (#47266)" (#47568)

This reverts commit 648a5d8a.

* Handle simple placeholders in plurals

* Handle Date plural placeholders

* Improve variable names

* Turn assert into exceptions, add tests

* 399a29eed Roll src/third_party/dart 141fcfa61092..4681868aaf77 (9 commits) (flutter/engine#14590)

* 97fd705a4 Roll src/third_party/skia 7e2dea568299..dcac29b02d02 (3 commits) (flutter/engine#14591)

* 6d9288740 Roll src/third_party/dart 4681868aaf77..b92fefdfe971 (1 commits) (flutter/engine#14592)

* 4d7313ffc Roll fuchsia/sdk/core/mac-amd64 from f51Q_... to VC7eE... (flutter/engine#14593)

* fac66c28d [web] Long press fix on Safari on IOS (flutter/engine#14588)

* 32eb6e922 Roll src/third_party/skia dcac29b02d02..088913a63b7e (1 commits) (flutter/engine#14597)

* ede1b6b20 Roll fuchsia/sdk/core/linux-amd64 from 25LzW... to TUoVa... (flutter/engine#14596)

* cce5afd48 Roll src/third_party/dart b92fefdfe971..886615d0f95b (2 commits) (flutter/engine#14595)

* 9b299f2c2 fix editable placement in a11y mode (flutter/engine#14581)

* 33813929e [web] implement pushImageFilter (flutter/engine#14599)

This adds the ability to define variants of tests with different environmental values for a particular testWidgets test.

This allows you to run the same test multiple times with a different test environment. One test variant has been implemented that allows running a test with different settings of the TargetPlatform.

* bb118c655 Roll src/third_party/dart 8d11c1dce64a..642f8d052fd7 (1 commits) (flutter/engine#14574)

* 09c434d26 Use ELF for Dart AOT snapshots on Fuchsia. (flutter/engine#13896)

* e1e78512a Roll fuchsia/sdk/core/linux-amd64 from VdBKA... to uFFWW... (flutter/engine#14575)

* f317f8f7f Roll src/third_party/skia c76ac8e325c7..77742c350371 (1 commits) (flutter/engine#14576)

* 2ba563336 instructions for running firefox/safari tests (flutter/engine#14562)

* 9cf1e46b9 Roll src/third_party/dart 642f8d052fd7..7113fc79a83c (3 commits) (flutter/engine#14578)

* f5b877af9 [web] Run engine tests on Safari locally by launching safari installed on MacOS (flutter/engine#14555)

* 68d919670 Fix DOM-based ParagraphRuler.hitTest() (flutter/engine#14504)

* bb65df884 Roll src/third_party/skia 77742c350371..a8352ccaae37 (8 commits) (flutter/engine#14579)

* ad1ab564b Roll src/third_party/dart 7113fc79a83c..e50d98cd5651 (8 commits) (flutter/engine#14580)

* 22413efc4 Update formatting in web_ui scene bulder to match flutter style and dartfmt. (flutter/engine#14539)

* 6e825e7bd Roll fuchsia/sdk/core/mac-amd64 from Ykb4b... to f51Q_... (flutter/engine#14584)

* 1d3bb8c27 Fix message_loop_fuchsia and thus enable fml_tests and flow_tests for Fuchsia (flutter/engine#14583)

* 1f7bb9d0c Wire up OpacityLayer to Scenic (flutter/engine#14577)

* 11db035ca Roll src/third_party/skia a8352ccaae37..87e9ddb675b6 (11 commits) (flutter/engine#14585)

* bd58af743 Roll src/third_party/dart e50d98cd5651..141fcfa61092 (3 commits) (flutter/engine#14586)

* 929b1edff Engine support for ImageFiltered widget (flutter/engine#14491)

* 40b84fc19 Fix lint warnings across web_ui, add missing browserEngine case in text field. (flutter/engine#14535)

* ea1d330d8 Roll fuchsia/sdk/core/linux-amd64 from uFFWW... to 25LzW... (flutter/engine#14587)

* 854d5f8e9 Roll src/third_party/skia 87e9ddb675b6..7e2dea568299 (1 commits) (flutter/engine#14589)

* ffb497de2 Roll src/third_party/skia 9e0afb791ac2..c76ac8e325c7 (4 commits) (flutter/engine#14571)

* da08f4ce2 Roll src/third_party/dart aa6709974dea..8d11c1dce64a (2 commits) (flutter/engine#14572)

* 472197a8e Roll fuchsia/sdk/core/mac-amd64 from NHgyx... to Ykb4b... (flutter/engine#14573)

Check Xcode build setting FULL_PRODUCT_NAME for the name of the built app during flutter run (#47266)

[flutter_tool] ensure extraGenSnapshotArguments are forwarded to gen_snapshot from Android builds (#47059)

Just a docs text change.

* 988b8f149 Fix FontLoader does not remove the cache in web engine (flutter/engine#14536)

* 0aacac72d Roll src/third_party/skia 21df075cab00..e6a2ad81ab40 (1 commits) (flutter/engine#14552)

* 417dd7e8e Roll fuchsia/sdk/core/mac-amd64 from esDH2... to NHgyx... (flutter/engine#14554)

* f2e841d50 [Web] Fix pointer binding  (flutter/engine#14378)

* 105eb66b9 Roll src/third_party/skia e6a2ad81ab40..8fec4140f614 (17 commits) (flutter/engine#14557)

* 1ecfdcb94 [web] Calculate align offset for each paragraph line (LineMetrics.left) (flutter/engine#14537)

* dda3619aa Roll src/third_party/dart 270966b16044..171059d27689 (19 commits) (flutter/engine#14558)

* 9c1bd8aee Fixes Objective-C objects memory leaks (flutter/engine#14326)

* f2dbeb8aa Reland Wire up Opacity on Fuchsia (flutter/engine#14559)

* 2f536e537 Roll fuchsia/sdk/core/linux-amd64 from jsuQq... to VdBKA... (flutter/engine#14560)

* 4312d37eb Revert "[fuchsia] Add diagnostics directory to the set of remote dirs (#14470)" (flutter/engine#14566)

* 5c77ea149 Roll src/third_party/skia 8fec4140f614..9e0afb791ac2 (4 commits) (flutter/engine#14563)

* a09ff7c42 Roll src/third_party/dart 171059d27689..aa6709974dea (11 commits) (flutter/engine#14567)

* 0f90e6546 Revert "[web] Calculate align offset for each paragraph line (LineMetrics.left) (#14537)" (flutter/engine#14569)

This reverts commit c235998a.

* fa1adf4f2 Roll src/third_party/dart c9d89d55a60e..6fcd1de98c2c (8 commits) (flutter/engine#14551)

* 6ea69a0d4 Revert "Wire up Opacity on Fuchsia, round 2 (#14024)" (flutter/engine#14543)

* 1e1f37107 Roll src/third_party/dart 6fcd1de98c2c..270966b16044 (7 commits) (flutter/engine#14553)

This reverts commit d4b49ce9.