dart2js cps: Propagate container types for lists.

pkg/compiler/lib/src/common/names.dart

Index: pkg/compiler/lib/src/common/names.dart
diff --git a/pkg/compiler/lib/src/common/names.dart b/pkg/compiler/lib/src/common/names.dart
index 45c7b1f45e8a090f16e01a2ed8fb01d2ade8ed13..fa1812ced1dfde40040c03606acad5628de0be05 100644
--- a/pkg/compiler/lib/src/common/names.dart
+++ b/pkg/compiler/lib/src/common/names.dart
@@ -38,6 +38,9 @@ class Identifiers {
 
   /// The name of the runtime type property on 'Object'.
   static const String runtimeType_ = 'runtimeType';
+
+  /// The name of the getter returning the size of containers and strings.
+  static const String length = 'length';
 }
 
 /// [Name]s commonly used.
@@ -67,6 +70,8 @@ class Names {
   static const Name INDEX_NAME = const PublicName("[]");
   static const Name INDEX_SET_NAME = const PublicName("[]=");
   static const Name CALL_NAME = Names.call;
+
+  static const Name length = const PublicName(Identifiers.length);
 }
 
 /// [Selector]s commonly used.
@@ -101,6 +106,8 @@ class Selectors {
       new Selector.call(const PublicName("compareTo"), CallStructure.ONE_ARG);
 
   static final Selector equals = new Selector.binaryOperator('==');
+
+  static final Selector length = new Selector.getter(Names.length);
 }
 
 /// [Uri]s commonly used.
@@ -123,4 +130,4 @@ class Uris {
   /// The URI for 'dart:_native_typed_data'.
   static final Uri dart__native_typed_data =
       new Uri(scheme: 'dart', path: '_native_typed_data');
-}
+}