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 Dart to 7b56ef96e2cc77150738366566357912c442ff5b
* Updated license

* Roll dart dep

* Roll dartdoc dep

* Update license hash, ignore changes to file list

* Roll dart forward

* Roll dart to latest b7ef001fec0eacd6451ae71746d0a0ef090aac59

* Update license hash, ignore changes to the file list

* Introduce frontend_server that allows for interactive and batch modes.

Example of batch mode:
```
$ dart $HOME/p/f/t11/flutter/engine/src/flutter/frontend_server/bin/server.dart --sdk-root=$HOME/p/f/t11/flutter/engine/src/out/android_debug/flutter_patched_sdk --platform-kernel-dill=$HOME/p/f/t11/flutter/engine/src/out/android_debug/flutter_patched_sdk/platform.dill $HOME/p/f/t11/flutter/flutter/examples/flutter_gallery/lib/main.dart

out: result 79256789-598c-4909-a9e4-0ef36d4c26ba
out: 'State&TickerProviderStateMixin^#U0^' is exported from both 'package:flutter/src/widgets/animated_cross_fade.dart' and 'package:flutter/src/widgets/animated_list.dart'.
...
out: Superclass has no method named 'hitTest'.
out: 79256789-598c-4909-a9e4-0ef36d4c26ba $HOME/p/f/t11/flutter/flutter/examples/flutter_gallery/lib/main.dart.dill
$
```

Example of interactive mode - communication via stdin/stdout:
```
$ dart $HOME/p/f/t11/flutter/engine/src/flutter/frontend_server/bin/server.dart --sdk-root=$HOME/p/f/t11/flutter/engine/src/out/android_debug/flutter_patched_sdk --platform-kernel-dill=$HOME/p/f/t11/flutter/engine/src/out/android_debug/flutter_patched_sdk/platform.dill --incremental

out: Frontend server is ready.
in: compile abc.dart
out: result fd99c0f9-12bb-4083-818e-2521d454fdc8
out: fd99c0f9-12bb-4083-818e-2521d454fdc8 abc.dart.dill
in: accept
in: recompile kuka
in: 123.dart
in: 456.dart
in: kuka
out: result d12f8d05-6c79-44f7-a775-1d3469e1be53
in: quit
$
```

* Add test. Cleanup dependencies.

* One more test with mocks

* Remove platform-kernel option. Refactored CompilerOptions. Clean up comments.

* Update license

* Use Uri.base.resolve consistently. Ensure folder path for sdk root. Fix test.

* Fix main_dart for frontend_server build target

* Reintroduce .packages file, add README.md, revert changes to licenses_flutter

* Run analyzer on frontend-server. Update .packages deps so tests can be run too.

* Add analyzer options file

* Clean up dependencies

* Add frontend_server files to license file back

* Fix comment in analysis_options.yaml

* Run frontend_server tests in travis

* Update licenses

* Change a+x permission on travis/test.sh

* pub get before pub run test

* Fix path to when

* Clarify accept/reject instructions

* Formatting, fixed docs, style

* Update license script to skip .travis.yml, when/example. Update license file.

* Update style nits

* Fix license

* Trim license extracted text. Fix licenses

* Update licenses_third_party signature

* Few more tests

* Update dart license

* Update dart license

* Style changes. Fix return value for Future<Null>

- Roll Dart to e673ff0b253d8cadd3249aa0d8efe0516606d704
- Update licenses_dart

- Roll Dart to 491390eeaa7974f44a8931d10a899c39c0df8dda
- Register the EmbedderInformationCallback

* Revert "Revert "Build standalone dart sdk as part of Flutter engine. (#3954)" (#3970)"

This reverts commit 86e007d9.

* Add 7-zip download as a hook

* Advance buildroot dependency

* Fix buildroot dependency

This reverts commit a5bac1ee.

This doesn't work on Windows.

* Update dart deps and add create_sdk for host builds

* Set and use is_flutter flag

* Update to make it compatible with latest changes in https://codereview.chromium.org/2998503002/

* Fix deps

* Roll dart dependency to pick up new arguments

* Merge

* Update deps

* Update license

* roll Dart to 21eddc429e9c7260de00a9af7cad94baba830f59

* update licenses

Roll Dart to 69817eea182384b40ef658d578fd49cac00c5874

The new `dart_observatory_pub_packages_rev` dependent on the rolled `dart_revision` required the update of the licensing files

Roll Dart to be95b916ddf0af2b204286a438e7169e3bb2c67a.

* Roll Dart to 1bfd01c1f7a57fed039ce8ab95df2a5f14cf63b6

* fix licence

Roll Dart VM to daa38a2ea21d290e45adb509dc60418b22ec7eba for fix to Thumb profile sample collection.

Roll buildroot to b0b836db790abff26695a944224a4934480f2f48.

Roll Dart to f445c318184b30b3db997ac27f357bcb5d45670a.

Fuchsia issue TO-365

* Roll dart and buildroot deps since they have to be updated together to get and use prebuilt dart sdk in correct location.

* Update license

* Roll Dart dependency

* Update license file

* Roll Dart dependency in Flutter engine to pick up assert in constructor's initializers support

* Missing comma

* Use correct revision

* Rev up, update license

* Update to sky/pacakges/sky_engine/LICENSE

* Roll to updated ver with license text fixed

* Update license file

* Roll dart to 64ce51ce4bc3aa4248dba87c44775c9b84bd2b5d (last roll 13 days ago)

* Update license file - ORIGIN was changed because first file was added

Update targets only included in host_debug_unopt.

This reverts commit f5d0004e.