First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/mirror_helper_rename_test.dart

Index: tests/compiler/dart2js/mirror_helper_rename_test.dart
diff --git a/tests/compiler/dart2js/mirror_helper_rename_test.dart b/tests/compiler/dart2js/mirror_helper_rename_test.dart
index 67f1a956312c237dcce2a5d66c041c9f079b3f4e..9b82355e9972dfeab80075e9dd90140af445897b 100644
--- a/tests/compiler/dart2js/mirror_helper_rename_test.dart
+++ b/tests/compiler/dart2js/mirror_helper_rename_test.dart
@@ -3,6 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
+import 'dart:async';
+import "package:async_helper/async_helper.dart";
 import 'memory_compiler.dart' show compilerFor;
 import '../../../sdk/lib/_internal/compiler/implementation/apiimpl.dart' show
     Compiler;
@@ -26,7 +28,7 @@ main() {
   testWithoutMirrorHelperLibrary(minify: false);
 }
 
-Compiler runCompiler({useMirrorHelperLibrary: false, minify: false}) {
+Future<Compiler> runCompiler({useMirrorHelperLibrary: false, minify: false}) {
   List<String> options = ['--output-type=dart'];
   if (minify) {
     options.add('--minify');
@@ -34,58 +36,59 @@ Compiler runCompiler({useMirrorHelperLibrary: false, minify: false}) {
   Compiler compiler = compilerFor(MEMORY_SOURCE_FILES, options: options);
   DartBackend backend = compiler.backend;
   backend.useMirrorHelperLibrary = useMirrorHelperLibrary;
-  compiler.runCompiler(Uri.parse('memory:main.dart'));
-  return compiler;
+  return
+      compiler.runCompiler(Uri.parse('memory:main.dart')).then((_) => compiler);
 }
 
 void testWithMirrorHelperLibrary({bool minify}) {
-  Compiler compiler = runCompiler(useMirrorHelperLibrary: true, minify: minify);
-
-  DartBackend backend = compiler.backend;
-  MirrorRenamer mirrorRenamer = backend.mirrorRenamer;
-  Map<Node, String> renames = backend.renames;
-  Map<String, SourceString> symbols = mirrorRenamer.symbols;
-
-  Expect.isFalse(null == backend.mirrorHelperLibrary);
-  Expect.isFalse(null == backend.mirrorHelperGetNameFunction);
-
-  for (Node n in renames.keys) {
-    if (symbols.containsKey(renames[n])) {
-      if(n.toString() == 'getName') {
-        Expect.equals(
-            const SourceString(MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION),
-            symbols[renames[n]]);
-      } else {
-        Expect.equals(n.toString(), symbols[renames[n]].stringValue);
+  asyncTest(() => runCompiler(useMirrorHelperLibrary: true, minify: minify).
+      then((Compiler compiler) {
+    DartBackend backend = compiler.backend;
+    MirrorRenamer mirrorRenamer = backend.mirrorRenamer;
+    Map<Node, String> renames = backend.renames;
+    Map<String, SourceString> symbols = mirrorRenamer.symbols;
+
+    Expect.isFalse(null == backend.mirrorHelperLibrary);
+    Expect.isFalse(null == backend.mirrorHelperGetNameFunction);
+
+    for (Node n in renames.keys) {
+      if (symbols.containsKey(renames[n])) {
+        if(n.toString() == 'getName') {
+          Expect.equals(
+              const SourceString(MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION),
+              symbols[renames[n]]);
+        } else {
+          Expect.equals(n.toString(), symbols[renames[n]].stringValue);
+        }
       }
     }
-  }
-
-  String output = compiler.assembledCode;
-  String getNameMatch = MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION;
-  Iterable i = getNameMatch.allMatches(output);
 
+    String output = compiler.assembledCode;
+    String getNameMatch = MirrorRenamer.MIRROR_HELPER_GET_NAME_FUNCTION;
+    Iterable i = getNameMatch.allMatches(output);
 
-  if (minify) {
-    Expect.equals(0, i.length);
-  } else {
-    // Appears twice in code (defined & called).
-    Expect.equals(2, i.length);
-  }
+    if (minify) {
+      Expect.equals(0, i.length);
+    } else {
+      // Appears twice in code (defined & called).
+      Expect.equals(2, i.length);
+    }
 
-  String mapMatch = 'const<String,SourceString>';
-  i = mapMatch.allMatches(output);
-  Expect.equals(1, i.length);
+    String mapMatch = 'const<String,SourceString>';
+    i = mapMatch.allMatches(output);
+    Expect.equals(1, i.length);
+  }));
 }
 
 void testWithoutMirrorHelperLibrary({bool minify}) {
-  Compiler compiler =
-      runCompiler(useMirrorHelperLibrary: false, minify: minify);
-  DartBackend backend = compiler.backend;
-
-  Expect.equals(null, backend.mirrorHelperLibrary);
-  Expect.equals(null, backend.mirrorHelperGetNameFunction);
-  Expect.equals(null, backend.mirrorRenamer);
+  asyncTest(() => runCompiler(useMirrorHelperLibrary: false, minify: minify).
+      then((Compiler compiler) {
+    DartBackend backend = compiler.backend;
+
+    Expect.equals(null, backend.mirrorHelperLibrary);
+    Expect.equals(null, backend.mirrorHelperGetNameFunction);
+    Expect.equals(null, backend.mirrorRenamer);
+  }));
 }
 
 const MEMORY_SOURCE_FILES = const <String, String> {