Move js_ast library to its own package under pkg

IT IS NECESSARY TO REBUILD AFTER SYNCING TO THIS CL.
Rebuilding creates a needed symlink in out/... for the new js_ast package.

R=floitsch@google.com

Review URL: https://codereview.chromium.org//931953002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44012 260f80e4-7a28-3924-810f-c04153c831b5

pkg/compiler/lib/src/js/js.dart

@@ -4,9 +4,8 @@
 
 library js;
 
-// TODO(sra): This will become a package import.
-import 'js_ast.dart';
-export 'js_ast.dart';
+import 'package:js_ast/js_ast.dart';
+export 'package:js_ast/js_ast.dart';
 
 import '../io/code_output.dart' show CodeBuffer;
 import '../io/source_information.dart' show SourceInformation;

pkg/js_ast/LICENSE

@@ -0,0 +1,26 @@
+Copyright 2015, the Dart project authors. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google Inc. nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

pkg/js_ast/README.md

@@ -0,0 +1,4 @@
+js_ast
+======
+
+A library for creating JavaScript ASTs from templates.

pkg/js_ast/lib/js_ast.dart

@@ -4,10 +4,10 @@
 
 library js_ast;
 
-import 'precedence.dart';
-import 'characters.dart' as charCodes;
+import 'src/precedence.dart';
+import 'src/characters.dart' as charCodes;
 
-part 'nodes.dart';
-part 'builder.dart';
-part 'printer.dart';
-part 'template.dart';
+part 'src/nodes.dart';
+part 'src/builder.dart';
+part 'src/printer.dart';
+part 'src/template.dart';

pkg/js_ast/pubspec.yaml

@@ -0,0 +1,9 @@
+name: js_ast
+version: 0.0.0
+author: Dart Team <misc@dartlang.org>
+description: Library creating and printing JavaScript ASTs.
+homepage: http://www.dartlang.org
+dev_dependencies:
+  unittest: ">=0.9.0 <0.10.0"
+environment:
+  sdk: ">=0.8.10+6 <2.0.0"