Rename the global inference task and reduce it's API surface by introducing the

tests/compiler/dart2js/list_tracer_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:expect/expect.dart';
 import "package:async_helper/async_helper.dart";
 import 'package:compiler/src/types/types.dart'
     show ContainerTypeMask, TypeMask;
 
 import 'compiler_helper.dart';
@@ skipping 181 matching lines @@
   doTest('new List(1)', nullify: true); // Test fixed list.
   doTest('new List.filled(1, 0)', nullify: false); // Test List.filled.
   doTest('new List.filled(1, null)', nullify: true); // Test List.filled.
 }
 
 void doTest(String allocation, {bool nullify}) {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(generateTest(allocation), uri,
       expectedErrors: 0, expectedWarnings: 1);
   asyncTest(() => compiler.run(uri).then((_) {
-    var typesTask = compiler.typesTask;
-    var typesInferrer = typesTask.typesInferrer;
+    var commonMasks = compiler.commonMasks;
+    var typesInferrer = compiler.globalInference.typesInferrer;
 
     checkType(String name, type) {
       var element = findElement(compiler, name);
       ContainerTypeMask mask = typesInferrer.getTypeOfElement(element);
       if (nullify) type = type.nullable();
       Expect.equals(type, simplify(mask.elementType, compiler), name);
     }
 
-    checkType('listInField', typesTask.numType);
-    checkType('listPassedToMethod', typesTask.numType);
-    checkType('listReturnedFromMethod', typesTask.numType);
-    checkType('listUsedWithCascade', typesTask.numType);
-    checkType('listUsedInClosure', typesTask.numType);
-    checkType('listPassedToSelector', typesTask.numType);
-    checkType('listReturnedFromSelector', typesTask.numType);
-    checkType('listUsedWithAddAndInsert', typesTask.numType);
-    checkType('listUsedWithConstraint', typesTask.positiveIntType);
-    checkType('listEscapingFromSetter', typesTask.numType);
-    checkType('listUsedInLocal', typesTask.numType);
-    checkType('listEscapingInSetterValue', typesTask.numType);
-    checkType('listEscapingInIndex', typesTask.numType);
-    checkType('listEscapingInIndexSet', typesTask.uint31Type);
-    checkType('listEscapingTwiceInIndexSet', typesTask.numType);
-    checkType('listSetInNonFinalField', typesTask.numType);
-    checkType('listWithChangedLength', typesTask.uint31Type.nullable());
+    checkType('listInField', commonMasks.numType);
+    checkType('listPassedToMethod', commonMasks.numType);
+    checkType('listReturnedFromMethod', commonMasks.numType);
+    checkType('listUsedWithCascade', commonMasks.numType);
+    checkType('listUsedInClosure', commonMasks.numType);
+    checkType('listPassedToSelector', commonMasks.numType);
+    checkType('listReturnedFromSelector', commonMasks.numType);
+    checkType('listUsedWithAddAndInsert', commonMasks.numType);
+    checkType('listUsedWithConstraint', commonMasks.positiveIntType);
+    checkType('listEscapingFromSetter', commonMasks.numType);
+    checkType('listUsedInLocal', commonMasks.numType);
+    checkType('listEscapingInSetterValue', commonMasks.numType);
+    checkType('listEscapingInIndex', commonMasks.numType);
+    checkType('listEscapingInIndexSet', commonMasks.uint31Type);
+    checkType('listEscapingTwiceInIndexSet', commonMasks.numType);
+    checkType('listSetInNonFinalField', commonMasks.numType);
+    checkType('listWithChangedLength', commonMasks.uint31Type.nullable());
 
-    checkType('listPassedToClosure', typesTask.dynamicType);
-    checkType('listReturnedFromClosure', typesTask.dynamicType);
-    checkType('listUsedWithNonOkSelector', typesTask.dynamicType);
-    checkType('listPassedAsOptionalParameter', typesTask.numType);
-    checkType('listPassedAsNamedParameter', typesTask.numType);
-    checkType('listStoredInList', typesTask.uint31Type);
-    checkType('listStoredInListButEscapes', typesTask.dynamicType);
+    checkType('listPassedToClosure', commonMasks.dynamicType);
+    checkType('listReturnedFromClosure', commonMasks.dynamicType);
+    checkType('listUsedWithNonOkSelector', commonMasks.dynamicType);
+    checkType('listPassedAsOptionalParameter', commonMasks.numType);
+    checkType('listPassedAsNamedParameter', commonMasks.numType);
+    checkType('listStoredInList', commonMasks.uint31Type);
+    checkType('listStoredInListButEscapes', commonMasks.dynamicType);
 
     if (!allocation.contains('filled')) {
       checkType('listUnset', new TypeMask.nonNullEmpty());
       checkType('listOnlySetWithConstraint', new TypeMask.nonNullEmpty());
     }
   }));
 }