Add source location to function declarations.

tests/compiler/dart2js/sourcemaps/js_tracer.dart

Index: tests/compiler/dart2js/sourcemaps/js_tracer.dart
diff --git a/tests/compiler/dart2js/sourcemaps/js_tracer.dart b/tests/compiler/dart2js/sourcemaps/js_tracer.dart
index 4ea4e91a7f7dbeec83c80705239fddc960e7bac0..56d6f129beb7eef7921d13fd4d29a9bd325a82db 100644
--- a/tests/compiler/dart2js/sourcemaps/js_tracer.dart
+++ b/tests/compiler/dart2js/sourcemaps/js_tracer.dart
@@ -35,7 +35,10 @@ class StepTraceListener extends TraceListener
     SourcePositionKind sourcePositionKind = SourcePositionKind.START;
     List text = [node];
     switch (kind) {
-      case StepKind.FUN:
+      case StepKind.FUN_ENTRY:
+        text = ['<entry>'];
+        break;
+      case StepKind.FUN_EXIT:
         sourcePositionKind = SourcePositionKind.INNER;
         text = ['<exit>'];
         break;