Inline source maps as part of each script.

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.dart
index dc776c86d689a9ee2e75840b9895e580f8f76cdb..fc156363c3dd7b4b305b8798a3296115612e1b2f 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/rtti.dart
@@ -208,11 +208,16 @@ void tagLazy(value, 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);
@@ -222,6 +227,7 @@ getModuleLibraries(String name) {
 }
 
 /// Track all libraries
-void trackLibraries(String moduleName, libraries) {
+void trackLibraries(String moduleName, libraries, sourceMap) {
+  JS('', '#.set(#, #)', _loadedSourceMaps, moduleName, sourceMap);
   JS('', '#.set(#, #)', _loadedModules, moduleName, libraries);
-}
+}