Make all DDC internal stack traces apply source maps.

pkg/dev_compiler/lib/js/es6/dart_sdk.js

Index: pkg/dev_compiler/lib/js/es6/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/es6/dart_sdk.js b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
index 70a515d7bbbac9a3bed5b9715449ed7527040d25..989141eb6557c8995859b188900d196fa30e5bfa 100644
--- a/pkg/dev_compiler/lib/js/es6/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
@@ -4069,6 +4069,13 @@ dart.setSignature(_debugger.TypeFormatter, {
     children: dart.definiteFunctionType(core.List$(_debugger.NameValuePair), [dart.dynamic])
   })
 });
+_debugger.StackTraceMapper = dart.typedef('StackTraceMapper', () => dart.functionType(core.String, [core.String]));
+dart.copyProperties(_debugger, {
+  get stackTraceMapper() {
+    let _util = dart.global.$dartStackTraceUtility;
+    return _debugger.StackTraceMapper._check(_util != null ? _util.mapper : null);
+  }
+});
 _debugger.registerDevtoolsFormatter = function() {
   let formatters = JSArrayOfJsonMLFormatter().of([_debugger._devtoolsFormatter]);
   dart.global.devtoolsFormatters = formatters;
@@ -11938,6 +11945,9 @@ _js_helper._StackTrace = class _StackTrace extends core.Object {
     let trace = null;
     if (this[_exception] !== null && typeof this[_exception] === "object") {
       trace = this[_exception].stack;
+      if (trace != null && _debugger.stackTraceMapper != null) {
+        trace = _debugger.stackTraceMapper(trace);
+      }
     }
     return this[_trace] = trace == null ? '' : trace;
   }