chore(deps): bump meta from 1.18.0 to 1.19.0 - #1175

Sourced from meta's changelog.

1.19.0 - 2016-08-26

Language changes

• The language now allows a trailing comma after the last argument of a call and the last parameter of a function declaration. This can make long argument or parameter lists easier to maintain, as commas can be left as-is when reordering lines. For details, see SDK issue 26644.

Tool Changes

• dartfmt - upgraded to v0.2.9+1

  • Support trailing commas in argument and parameter lists.
  • Gracefully handle read-only files.
  • About a dozen other bug fixes.

• Pub

  • Added a --no-packages-dir flag to pub get, pub upgrade, and pub downgrade. When this flag is passed, pub will not generate a packages/ directory, and will remove that directory and any symlinks to it if they exist. Note that this replaces the unsupported --no-package-symlinks flag.

  • Added the ability for packages to declare a constraint on the [Flutter][] SDK:

    environment:
      flutter: ^0.1.2
      sdk: >=1.19.0 <2.0.0

    A Flutter constraint will only be satisfiable when pub is running in the context of the flutter executable, and when the Flutter SDK version matches the constraint.

  • Added sdk as a new package source that fetches packages from a hard-coded SDK. Currently only the flutter SDK is supported:

    dependencies:
      flutter_driver:
        sdk: flutter
        version: ^0.0.1

    A Flutter sdk dependency will only be satisfiable when pub is running in

... (truncated)

• c38a8d1 Extend Future.then inference to subclasses
• 0e12dbf fixes #27113, future.then shouldn't disable upwards block inference
• 47f1415 Type check field initializers in the correct context.
• 1c81fe7 Fix calling object methods and properties on function types
• 3f95c3e Ignore any missing dependencies while linking in PubSummaryManager.
• 5bfd6e6 Add PubSummaryManager.computeUnlinkedForFolder() for Flutter.
• efb961c Create a way to find SDK extensions and integrate it
• e31e775 Move summary inspection code out of pkg/analyzer/lib.
• b7a0a42 Add --bazel-paths option to dart2js entrypoint.
• b3a38bd fix #27088, future then upwards inference
• Additional commits viewable in compare view

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