Add top level type inference logic for integer literals.

pkg/front_end/lib/src/fasta/source/outline_builder.dart

Index: pkg/front_end/lib/src/fasta/source/outline_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/source/outline_builder.dart b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
index 20d32895ba10359a672b3190ee49a5e50c50c949..12ef5d5bea8ff34e7e9b2cc88bcc67d35f83f5da 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -653,11 +653,11 @@ class OutlineBuilder extends UnhandledListener {
   @override
   void endTopLevelFields(int count, Token beginToken, Token endToken) {
     debugEvent("endTopLevelFields");
-    List namesAndOffsets = popList(count * 2);
+    List namesOffsetsAndInitializers = popList(count * 4);
     TypeBuilder type = pop();
     int modifiers = Modifier.validate(pop());
     List<MetadataBuilder> metadata = pop();
-    library.addFields(metadata, modifiers, type, namesAndOffsets);
+    library.addFields(metadata, modifiers, type, namesOffsetsAndInitializers);
     checkEmpty(beginToken.charOffset);
   }
 
@@ -665,11 +665,11 @@ class OutlineBuilder extends UnhandledListener {
   void endFields(
       int count, Token covariantToken, Token beginToken, Token endToken) {
     debugEvent("Fields");
-    List namesAndOffsets = popList(count * 2);
+    List namesOffsetsAndInitializers = popList(count * 4);
     TypeBuilder type = pop();
     int modifiers = Modifier.validate(pop());
     List<MetadataBuilder> metadata = pop();
-    library.addFields(metadata, modifiers, type, namesAndOffsets);
+    library.addFields(metadata, modifiers, type, namesOffsetsAndInitializers);
   }
 
   @override
@@ -751,14 +751,17 @@ class OutlineBuilder extends UnhandledListener {
   }
 
   @override
-  void endFieldInitializer(Token assignmentOperator) {
+  void endFieldInitializer(Token assignmentOperator, Token token) {
     debugEvent("FieldInitializer");
-    // Ignoring field initializers for now.
+    push(assignmentOperator.next);
+    push(token);
   }
 
   @override
   void handleNoFieldInitializer(Token token) {
     debugEvent("NoFieldInitializer");
+    push(NullValue.FieldInitializer);
+    push(NullValue.FieldInitializer);
   }
 
   @override