First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/resolver_test.dart

Index: tests/compiler/dart2js/resolver_test.dart
diff --git a/tests/compiler/dart2js/resolver_test.dart b/tests/compiler/dart2js/resolver_test.dart
index dcdcc070919b5386c606a65aee86a8e0d309f712..28d97c138e47b78776b45f28267cf32e1825d207 100644
--- a/tests/compiler/dart2js/resolver_test.dart
+++ b/tests/compiler/dart2js/resolver_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
+import 'dart:async';
 import 'dart:collection';
 
 import "../../../sdk/lib/_internal/compiler/implementation/resolution/resolution.dart";
@@ -783,11 +784,12 @@ List<String> asSortedStrings(Link link) {
   return result;
 }
 
-compileScript(String source) {
+Future compileScript(String source) {
   Uri uri = new Uri(scheme: 'source');
   MockCompiler compiler = compilerFor(source, uri);
-  compiler.runCompiler(uri);
-  return compiler;
+  return compiler.runCompiler(uri).then((_) {
+    return compiler;
+  });
 }
 
 checkMemberResolved(compiler, className, memberName) {
@@ -800,9 +802,9 @@ checkMemberResolved(compiler, className, memberName) {
 
 testToString() {
   final script = r"class C { toString() => 'C'; } main() { '${new C()}'; }";
-  final compiler = compileScript(script);
-
-  checkMemberResolved(compiler, 'C', buildSourceString('toString'));
+  compileScript(script).then((compiler) {
+    checkMemberResolved(compiler, 'C', buildSourceString('toString'));
+  });
 }
 
 operatorName(op, isUnary) {
@@ -816,10 +818,10 @@ testIndexedOperator() {
         operator[]=(ix, v) {}
       }
       main() { var c = new C(); c[0]++; }""";
-  final compiler = compileScript(script);
-
-  checkMemberResolved(compiler, 'C', operatorName('[]', false));
-  checkMemberResolved(compiler, 'C', operatorName('[]=', false));
+  compileScript(script).then((compiler) {
+    checkMemberResolved(compiler, 'C', operatorName('[]', false));
+    checkMemberResolved(compiler, 'C', operatorName('[]=', false));
+  });
 }
 
 testIncrementsAndDecrements() {
@@ -838,10 +840,10 @@ testIncrementsAndDecrements() {
         var d = new D();
         --d;
       }""";
-  final compiler = compileScript(script);
-
-  checkMemberResolved(compiler, 'A', operatorName('+', false));
-  checkMemberResolved(compiler, 'B', operatorName('+', false));
-  checkMemberResolved(compiler, 'C', operatorName('-', false));
-  checkMemberResolved(compiler, 'D', operatorName('-', false));
+  compileScript(script).then((compiler) {
+    checkMemberResolved(compiler, 'A', operatorName('+', false));
+    checkMemberResolved(compiler, 'B', operatorName('+', false));
+    checkMemberResolved(compiler, 'C', operatorName('-', false));
+    checkMemberResolved(compiler, 'D', operatorName('-', false));
+  });
 }