Update runtime files.

runtime/compiler/dart2js.vim

@@ -0,0 +1,28 @@
+" Vim compiler file
+" Compiler:	Dart to JavaScript Compiler
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2019 May 08
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "dart2js"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+CompilerSet makeprg=dart2js
+CompilerSet errorformat=%E%f:%l:%c:,
+		       \%-GError:\ Compilation\ failed.,
+		       \%CError:\ %m,
+		       \%Z\ %#^%\\+,
+		       \%C%.%#,
+		       \%trror:\ %m,
+		       \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save