update dependencies to use url style paths

pkg/dev_compiler/lib/src/compiler/module_builder.dart

 // Copyright (c) 2015, 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.
 
 import 'package:args/args.dart' show ArgParser, ArgResults;
 import 'package:path/path.dart' as path;
 
 import '../js_ast/js_ast.dart';
 import 'js_names.dart';
 
@@ skipping 256 matching lines @@
     // Collect imports/exports/statements.
     visitProgram(module);
 
     var dependencies = <LiteralString>[];
     var fnParams = <Parameter>[];
     for (var import in imports) {
       // TODO(jmesserly): we could use destructuring once Atom supports it.
       var moduleVar =
           new TemporaryId(pathToJSIdentifier(import.from.valueWithoutQuotes));
       fnParams.add(moduleVar);
-      dependencies.add(import.from);
+      dependencies.add(new LiteralString(
+          '"${path.url.joinAll(path.split(import.from.valueWithoutQuotes))}"'));

[Jennifer Messerly, 2017/05/04 18:20:26]

we chatted about moving this fix to code_generator (or to libraryToModule) ...
either of those sounds great!

 
       // TODO(jmesserly): optimize for the common case of a single import.
       for (var importName in import.namedImports) {
         // import * is not emitted by the compiler, so we don't handle it here.
         assert(!importName.isStar);
         var asName = importName.asName ?? importName.name;
         importStatements.add(js.statement(
             'const # = #.#', [asName, moduleVar, importName.name.name]));
       }
     }
@@ skipping 56 matching lines @@
   // Ensure the identifier first character is not numeric and that the whole
   // identifier is not a keyword.
   if (result.startsWith(new RegExp('[0-9]')) || invalidVariableName(result)) {
     return '\$$result';
   }
   return result;
 }
 
 // Invalid characters for identifiers, which would need to be escaped.
 final _invalidCharInIdentifier = new RegExp(r'[^A-Za-z_$0-9]');