Move source maps package to the dart repo, so it can be used by other internal

pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Run this test manually to verify that the fixnum library produces
 # the same results as native ints on a set of directed and random inputs.
 # Skip it when running automated tests because it times out.  This
 # test only makes sense on runtimes that support 64-bit integer
 # arithmetic natively, i.e., the VM.
 fixnum/test/int_64_vm_test: Skip
@@ skipping 13 matching lines @@
 
 # Don't compile tests that use dart:io to JS
 [ $compiler == dart2js || $compiler == dart2dart ]
 http/test/*: Skip
 oauth2/test/*: Skip
 pathos/test/*: Skip
 
 # Issue 8440 forces us to use pathos in the scheduled_test tests, which would
 # otherwise be dart2js-compatible.
 scheduled_test/test/*: Skip
+source_maps/test/vlq_test: Fail # A VLQ test checks for large numbers that
+                                # overflow in JS (numbers slightly larger than
+                                # 32 bits where we do bitwise operations).
 
 # Skip tests that use local file access if we're running in any browser
 [ $runtime == opera || $runtime == ff || $runtime == ie9 || $runtime == dartium || $runtime == chrome || $runtime == safari || $runtime == drt  || $runtime == jsshell]
 http/test/*: Skip
 oauth2/test/*: Skip
 pathos/test/*: Skip
 intl/test/date_time_format_file_even_test: Skip
 intl/test/date_time_format_file_odd_test: Skip
 intl/test/find_default_locale_standalone_test: Skip
 intl/test/message_extraction/message_extraction_test: Skip
@@ skipping 66 matching lines @@
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == mips ]
 *: Skip
 
 [ $arch == simmips ]
 *: Skip