Inline source maps as part of each script.

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.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.
 
 /// This library defines the association between runtime objects and
 /// runtime types.
 part of dart._runtime;
 
 /// Runtime type information.  This module defines the mapping from
 /// runtime objects to their runtime type information.  See the types
@@ skipping 190 matching lines @@
 void tagComputed(value, compute) {
   JS('', '#(#, #, { get: # })', defineProperty, value, _runtimeType, compute);
 }
 
 void tagLazy(value, compute) {
   JS('', '#(#, #, { get: # })', defineLazyProperty, value, _runtimeType,
       compute);
 }
 
 var _loadedModules = JS('', 'new Map()');
+var _loadedSourceMaps = JS('', 'new Map()');
 
 List getModuleNames() {
   return JS('', 'Array.from(#.keys())', _loadedModules);
 }
 
+String getSourceMap(module) {
+  return JS('String', '#.get(#)', _loadedSourceMaps, module);
+}
+
 /// Return all library objects in the specified module.
 getModuleLibraries(String name) {
   var module = JS('', '#.get(#)', _loadedModules, name);
   if (module == null) return null;
   JS('', '#[#] = #', module, _moduleName, name);
   return module;
 }
 
 /// Track all libraries
-void trackLibraries(String moduleName, libraries) {
+void trackLibraries(String moduleName, libraries, sourceMap) {
+  JS('', '#.set(#, #)', _loadedSourceMaps, moduleName, sourceMap);
   JS('', '#.set(#, #)', _loadedModules, moduleName, libraries);
-}
+}