Add toStructuredText to ConstantExpression and align method names with ConstantValue

pkg/compiler/lib/src/constants/constructors.dart

Index: pkg/compiler/lib/src/constants/constructors.dart
diff --git a/pkg/compiler/lib/src/constants/constructors.dart b/pkg/compiler/lib/src/constants/constructors.dart
index b8e747114d3d3ec88f60f3e2b33aa38f93f88b01..c0e09b699f78026b65041158d6914297053b5558 100644
--- a/pkg/compiler/lib/src/constants/constructors.dart
+++ b/pkg/compiler/lib/src/constants/constructors.dart
@@ -99,13 +99,13 @@ class GenerativeConstantConstructor implements ConstantConstructor {
     StringBuffer sb = new StringBuffer();
     sb.write("{'type': $type");
     defaultValues.forEach((key, ConstantExpression expression) {
-      sb.write(",\n 'default:${key}': ${expression.getText()}");
+      sb.write(",\n 'default:${key}': ${expression.toDartText()}");
     });
     fieldMap.forEach((FieldElement field, ConstantExpression expression) {
-      sb.write(",\n 'field:${field}': ${expression.getText()}");
+      sb.write(",\n 'field:${field}': ${expression.toDartText()}");
     });
     if (superConstructorInvocation != null) {
-      sb.write(",\n 'constructor: ${superConstructorInvocation.getText()}");
+      sb.write(",\n 'constructor: ${superConstructorInvocation.toDartText()}");
     }
     sb.write("}");
     return sb.toString();
@@ -189,9 +189,9 @@ class RedirectingGenerativeConstantConstructor implements ConstantConstructor {
     StringBuffer sb = new StringBuffer();
     sb.write("{'type': ${thisConstructorInvocation.type}");
     defaultValues.forEach((key, ConstantExpression expression) {
-      sb.write(",\n 'default:${key}': ${expression.getText()}");
+      sb.write(",\n 'default:${key}': ${expression.toDartText()}");
     });
-    sb.write(",\n 'constructor': ${thisConstructorInvocation.getText()}");
+    sb.write(",\n 'constructor': ${thisConstructorInvocation.toDartText()}");
     sb.write("}");
     return sb.toString();
   }
@@ -237,7 +237,7 @@ class RedirectingFactoryConstantConstructor implements ConstantConstructor {
   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.write("{");
-    sb.write("'constructor': ${targetConstructorInvocation.getText()}");
+    sb.write("'constructor': ${targetConstructorInvocation.toDartText()}");
     sb.write("}");
     return sb.toString();
   }