Add support for constants in the new go generator.

mojom/generators/go/translator/names.go

Index: mojom/generators/go/translator/names.go
diff --git a/mojom/generators/go/translator/names.go b/mojom/generators/go/translator/names.go
index 210ee71cf551068b98d1fa718d21e6326885e385..2b26f7f375e47d88e4b784181de37402c18b13b9 100644
--- a/mojom/generators/go/translator/names.go
+++ b/mojom/generators/go/translator/names.go
@@ -36,12 +36,38 @@ func (t *translator) goTypeName(typeKey string) string {
 	return goType
 }
 
+func (t *translator) goConstName(constKey string) (name string) {
+	if cachedName, ok := t.goConstNameCache[constKey]; ok {
+		return cachedName
+	}
+
+	declaredConstant := t.fileGraph.ResolvedConstants[constKey]
+
+	name = formatName(*declaredConstant.DeclData.ShortName)
+	if declaredConstant.DeclData.ContainerTypeKey != nil {
+		containerName := t.goTypeName(*declaredConstant.DeclData.ContainerTypeKey)
+		name = fmt.Sprintf("%s_%s", containerName, name)
+	}
+
+	return
+}
+
 func fileNameToPackageName(fileName string) string {
 	base := filepath.Base(fileName)
 	ext := filepath.Ext(base)
 	return base[:len(base)-len(ext)]
 }
 
+func (t *translator) importMojomFile(fileName string) {
+	pkgName := fileNameToPackageName(fileName)
+	pkgPath, err := filepath.Rel(t.Config.SrcRootPath(), fileName)
+	if err != nil {
+		panic(err.Error())
+	}
+	pkgPath = pkgPath[:len(pkgPath)-len(filepath.Ext(pkgPath))]
+	t.imports[pkgName] = pkgPath
+}
+
 func userDefinedTypeDeclData(userDefinedType mojom_types.UserDefinedType) *mojom_types.DeclarationData {
 	switch u := userDefinedType.(type) {
 	case *mojom_types.UserDefinedTypeEnumType: