* Roll Dart to 93d8c9fe2a2c22dc95ec85866af108cfab71ad06.

* Fix analyzer nits

* Try to pin dependency for tools/licenses to convert 2.0.1. Add verbose flag to pub get

* Pin dart to dev.16 to overcome pub issue

* Revert "Try to pin dependency for tools/licenses to convert 2.0.1. Add verbose flag to pub get"

This reverts commit d525a83f4494a511996226d328a5208d4651d46e as it is no
longer needed, was added to diagnose the problem, which turned out to be
a problem with pub in latest dart dev release.

* Fix license hash

* Reintroduce api methods and tests

In https://github.com/flutter/engine/pull/4554 I removed the .packages
file in the frontend_server directory, because it was out of sync with
the pubspec.yaml. It seems like the right solution is to run `pub get`
when we get the dependencies, i.e. when we run `gclient sync`.

Being out of sync is a problem because it means that running "pub get"
in that directory changes what packages are being used, and changes
the `.packages` file, which leads to having to revert changes before
committing code, etc. Having to regularly update this file doesn't
make much sense either, since the files that were missing were files
that are obtained from the network (e.g. the `io` package as used by
the `test` package).

Previously, (see
https://github.com/flutter/engine/pull/3982#issuecomment-323213199),
we did not do this because we did not want the build to call into the
network. This still does not call into the network during the _build_
phase, only during `gclient sync` (which is when all the dependencies
are brought down).

Currently the network dependencies only matter for running tests. We
should make sure this remains the case. Ideally we wouldn't even
depend on those.

* Roll Skia to 579f094f1259931c30dfd1623e8e22d74b4a7531

Fixes https://github.com/flutter/flutter/issues/13742

* Rolled dart-sdk to bd6cbd1ec7e79730ea1fd8ba01139f4e18a02290

* Updated third_party licenses.

* Roll Dart to version 8d7219a5b6a7c2505ff57f23e7cf80da4c724512

* Update third_party license file.

* Roll dart

* Update license

* Roll Skia and remove PngPixelSerializer

* Update licenses

Dart roll to cf1de7d46cd88e204380e8f96a993439be56b24c (#4457)

* Roll Skia to 58a3fcd4b3a2f7210586f4ec74dde8ac2b231e0f

* license again

* Roll dart to 962c18b627c76f22166cd0bb8ab9e1b21d3c7305.

* Update travis/licenses_golden/licenses_third_party

* Roll dart to f5fc335a4cdfcf96ae550044c64044ffe599e595

* Update license hash

* Roll a little further to pick up a revert

* Update hash

* Roll dart version in flutter engine.

* Update license file.

As we anyway always recommend to set the target_os to android.
Also if you happen to not set the target_os to android it messes up the licenses script output.

Picks up:
1. Windows support for flutter tester
2. Spaces in Dart package paths in the loader.

* roll to 09b8c91b696925c6c6a25c35173f2da27abf0fbe

* update licenses

* Roll skia to 0658f7

* Update licenses

* Roll dart

* Update license hash key, no changes to licenses themselves

With the update to HEAD of the Fuchsia buildtools repo, the new clang
toolchain picked up caused link-time breakage in android x86_64
libFlutter.so builds.

Sample log:
https://build.chromium.org/p/client.flutter/builders/Linux%20Engine/builds/1974/steps/build%20android_debug_x64/logs/stdio

Sample failure:
FAILED: libflutter.so libflutter.so.TOC lib.stripped/libflutter.so
../../third_party/android_tools/ndk/toolchains/x86_64-4.9/prebuilt/linux-x86_64/lib/gcc/x86_64-linux-android/4.9.x/../../../../x86_64-linux-android/bin/ld.gold: error: obj/flutter/shell/platform/android/libflutter/android_context_gl.o: unsupported reloc 42 against global symbol std::__ndk1::num_put<char, std::__ndk1::ostreambuf_iterator<char, std::__ndk1::char_traits<char> > >::id

This reverts commit 8ad42f0d.

* Roll garnet to b3ba6b6d6ab8ef658278cc43c9f839a8a8d1718e

Also includes a buildroot patch to pick up new dependency:
  build/config/fuchsia/sdk.gni

This fixes a build breakage in
garnet/public/lib/fxl/strings/string_view_unittest.cc wherein a variable
'sw5' was declared but the test erroneously tested against 'sw4' from
the previous test.

* Update license script for garnet

Reflects structural changes in directories we do not depend on. This
filters out the following directories in addition to what was already
filtered:
  garnet/drivers
  garnet/packages
  garnet/public/build/
  garnet/public/rust/

* Update licenses