Add top level type inference logic for integer literals.

pkg/front_end/lib/src/fasta/builder/ast_factory.dart

Index: pkg/front_end/lib/src/fasta/builder/ast_factory.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/ast_factory.dart b/pkg/front_end/lib/src/fasta/builder/ast_factory.dart
index 49baa53331179c944ddaaafe6512bf75added328..8c3c8bcd07c8e5a93a65480ae6b273d0d984f3eb 100644
--- a/pkg/front_end/lib/src/fasta/builder/ast_factory.dart
+++ b/pkg/front_end/lib/src/fasta/builder/ast_factory.dart
@@ -36,6 +36,9 @@ abstract class AstFactory {
   /// Creates a statement block.
   Block block(List<Statement> statements, int charOffset);
 
+  /// Creates a field.
+  Field field(Name name, int charOffset, {String fileUri});
+
   /// Creates an integer literal.
   IntLiteral intLiteral(value, int charOffset);
 
@@ -52,6 +55,9 @@ abstract class AstFactory {
   /// Creates a return statement.
   Statement returnStatement(Expression expression, int charOffset);
 
+  /// Creates a read of a static variable.
+  StaticGet staticGet(Member readTarget, int offset);
+
   /// Creates a variable declaration statement declaring one variable.
   ///
   /// TODO(paulberry): analyzer makes a distinction between a single variable