Mojom parser: Compute and validate struct field ordinals.

mojom/mojom_parser/parser/resolution_test.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package parser
 
 import (
         "fmt"
         "mojom/mojom_parser/mojom"
         "strings"
@@ skipping 1027 matching lines @@
 
         struct MyStruct {
                 const Color RED = BLUE;
 
         Color a_color = RED; // This should resolve to the local constant RED,
                              // and therefore the concrete value should be BLUE.
         };`
 
                 testFunc := func(descriptor *mojom.MojomDescriptor) error {
                         myStructType := descriptor.TypesByKey["TYPE_KEY:MyStruct"].(*mojom.MojomStruct)
-                        aColorField := myStructType.Fields[0]
+                        aColorField := myStructType.FieldsInLexicalOrder[0]
                         concreteValue := aColorField.DefaultValue.ResolvedConcreteValue().(*mojom.EnumValue)
                         key := concreteValue.ValueKey()
                         if key != "TYPE_KEY:Color.BLUE" {
                                 return fmt.Errorf("%s != TYPE_KEY:Color.BLUE", key)
                         }
                         return nil
                 }
                 test.addTestCase("", contents, testFunc)
         }
 
@@ skipping 327 matching lines @@
                         typeKey = mojom.ComputeTypeKey(t)
                 }
                 userDefinedType := descriptor.TypesByKey[typeKey]
                 if userDefinedType == nil {
                         panic(fmt.Sprintf("No type found for: %s", t))
                 }
                 typeSet.Add(userDefinedType)
         }
         return typeSet
 }