Inline source maps as part of each script.

pkg/dev_compiler/lib/src/compiler/code_generator.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 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 304 matching lines @@
 
     // Declare imports
     _finishImports(items);
 
     // Discharge the type table cache variables and
     // hoisted definitions.
     items.addAll(_typeTable.discharge());
 
     // Track the module name for each library in the module.
     // This data is only required for debugging.
-    _moduleItems.add(js.statement('#.trackLibraries(#, #);',
+    _moduleItems.add(js.statement(
+        '#.trackLibraries(#, #, ${JSModuleFile.sourceMapHoleID});',
         [_runtimeModule, js.string(name), _librariesDebuggerObject()]));
 
     // Add the module's code (produced by visiting compilation units, above)
     _copyAndFlattenBlocks(items, _moduleItems);
 
     // Build the module.
     return new JS.Program(items, name: _buildUnit.name);
   }
 
   JS.ObjectInitializer _librariesDebuggerObject() {
@@ skipping 5620 matching lines @@
   if (targetIdentifier.staticElement is! PrefixElement) return false;
   var prefix = targetIdentifier.staticElement as PrefixElement;
 
   // The library the prefix is referring to must come from a deferred import.
   var containingLibrary = resolutionMap
       .elementDeclaredByCompilationUnit(target.root as CompilationUnit)
       .library;
   var imports = containingLibrary.getImportsWithPrefix(prefix);
   return imports.length == 1 && imports[0].isDeferred;
 }