* Roll dart to 87538ffd7eca3405d13e46dcf3a20dcdcde9761e

* Update license hash

Revert "Revert "Roll dart to pick up change where platform.dill was removed (#4180)" (#4185)" (#4186)

This reverts commit a89f4669.

Doing the synchronized roll of Dart into engine as well as into Fuchsia
to prevent Fuchsia breakage.

This reverts commit 37f571ee.

* Roll dart to pick up change where platform.dill was removed

* Fix flutter patch sdk generation

* Update license hash. No changes to license text.

* Roll dart to pick up a fix for zero-rebuild problem

* Update license hash

* Switch from FlutterFastaTarget to FlutterTarget as FlutterFastaTarget was removed.

This reverts commit 0d2f0cb6.

Attempting to roll into the framework causes analysis errors with
mock classes implementing HTTP-related classes previously in dart:io:
[error] Classes can only implement other classes. (packages/flutter_tools/test/base/net_test.dart, line 94, col 41)
[error] Classes can only implement other classes. (packages/flutter_tools/test/base/net_test.dart, line 62, col 33)
[error] Classes can only implement other classes. (packages/flutter_tools/test/base/net_test.dart, line 78, col 40)
[error] Classes can only implement other classes. (packages/flutter_tools/test/src/context.dart, line 249, col 46)

and dartdoc failures:
dartdoc:stdout: [error] Target of URI doesn't exist: 'dart:_http'. at /home/travis/build/flutter/flutter/bin/cache/pkg/sky_engine/lib/io/io.dart, line 206.

* Revert "libtxt: handle characters encoded as multiple UTF-16 code units (#4165)"

This reverts commit 414c3fe3.

* Revert "Proper horizontal a11y scrolling on Android (#4163)"

This reverts commit 0448bf9b.

* Revert "Update Skia revision to 74a8296d7c. (#4164)"

This reverts commit ac53d29a.

* Revert "Revert "Revert engine Dart roll. (#4158)" (#4162)"

This reverts commit f97e974e.

This reverts commit 14aab33e.

e1aa8673 fixes issue with last dart
roll.

* Revert "Include _http into sky_engine libraries for analyzer (#4154)"

This reverts commit b930f107.

It is dependent upon the Dart roll, which breaks the engine.

* Revert "Roll dart to ade37f931e90b0fdb8fe16d6bf6f089545da55b6 (#4151)"

This reverts commit 6f1264fb.

This Dart roll breaks the engine build on Travis.

* Roll dart

* Update dart dependencies

* Update dart license hash. No changes to licenses

* Roll to one more version up

* Update license hash

This reverts commit 513828b5.

This breaks linux build due to outdated pool dependency in observatory pub packages.

* Roll dart dependency to 24ad1035147b65dd42e765b566f5002e87caafa7

* Update dart license hash(no relevant changes). Update dart deps.

* Revert "Roll Dart to 3d21a46b726c24ded2d3cb3cce4f43aeed875dbc. (#4127)"

This reverts commit 321e639b.

* Revert "Roll skia to 76d640d14ea78e1f827a2f545e7f0729cdc2896f (#4129)"

This reverts commit 6aaba3d2.

Makes it easy to upload a Dart change from a Flutter client.

By adding these events the new developer centric timeline will be able
to identify and correlate events related to the different stages of the
drawing pipeline.

Roll Dart to 62045a4590a333ae557f8f261a909ee75449cd70

* Roll garnet dependency to pick up a win bot fix

* Update license

* Fix remaining ftl->fxl conversions

The previous scripting pass at this did not account for objective c file endings

* Update tonic DEPS reference to the post-fxl version

* Roll Dart to 7b56ef96e2cc77150738366566357912c442ff5b
* Updated license

* Revert "Update buildroot to pull in clang_arm64 toolchain definitions. (#4065)"

This reverts commit dd4f1f29.

* Revert "Update paths for icu_data move (#4068)"

This reverts commit 9bde942a.

* Revert "Adapt semantics event handling to framework changes (#4066)"

This reverts commit ceb6d05c.

* Revert "Roll skia to afb0bd4. (#4064)"

This reverts commit befe2da6.

* Roll dart dep

* Roll dartdoc dep

* Update license hash, ignore changes to file list

This repository contains FTL now in the Fuchsia build.