Extract DiagnosticReporter implementation from Compiler.

pkg/compiler/lib/src/parser/element_listener.dart

Index: pkg/compiler/lib/src/parser/element_listener.dart
diff --git a/pkg/compiler/lib/src/parser/element_listener.dart b/pkg/compiler/lib/src/parser/element_listener.dart
index 95af9a4bcd3f74726fb1ca5e49a9f7a7e4985a5b..4b9799926a681b8fb70932ab52a50e033ad1e06c 100644
--- a/pkg/compiler/lib/src/parser/element_listener.dart
+++ b/pkg/compiler/lib/src/parser/element_listener.dart
@@ -63,7 +63,7 @@ typedef int IdGenerator();
  */
 class ElementListener extends Listener {
   final IdGenerator idGenerator;
-  final DiagnosticListener listener;
+  final DiagnosticReporter reporter;
   final CompilationUnitElementX compilationUnitElement;
   final StringValidator stringValidator;
   Link<StringQuoting> interpolationScope;
@@ -85,11 +85,11 @@ class ElementListener extends Listener {
   bool suppressParseErrors = false;
 
   ElementListener(
-      DiagnosticListener listener,
+      DiagnosticReporter reporter,
       this.compilationUnitElement,
       this.idGenerator)
-      : this.listener = listener,
-        stringValidator = new StringValidator(listener),
+      : this.reporter = reporter,
+        stringValidator = new StringValidator(reporter),
         interpolationScope = const Link<StringQuoting>();
 
   bool get currentMemberHasParseError {
@@ -110,7 +110,7 @@ class ElementListener extends Listener {
     StringNode node = popNode();
     // TODO(lrn): Handle interpolations in script tags.
     if (node.isInterpolation) {
-      listener.internalError(node,
+      reporter.internalError(node,
           "String interpolation not supported in library tags.");
       return null;
     }
@@ -201,7 +201,7 @@ class ElementListener extends Listener {
   }
 
   void addPartOfTag(PartOf tag) {
-    compilationUnitElement.setPartOf(tag, listener);
+    compilationUnitElement.setPartOf(tag, reporter);
   }
 
   void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
@@ -594,7 +594,7 @@ class ElementListener extends Listener {
 
   void pushElement(Element element) {
     popMetadata(element);
-    compilationUnitElement.addMember(element, listener);
+    compilationUnitElement.addMember(element, reporter);
   }
 
   List<MetadataAnnotation> popMetadata(ElementX element) {
@@ -614,7 +614,7 @@ class ElementListener extends Listener {
     }
     LibraryElementX implementationLibrary =
         compilationUnitElement.implementationLibrary;
-    implementationLibrary.addTag(tag, listener);
+    implementationLibrary.addTag(tag, reporter);
   }
 
   void pushNode(Node node) {
@@ -748,6 +748,6 @@ class ElementListener extends Listener {
     if (!memberErrors.isEmpty) {
       memberErrors = memberErrors.tail.prepend(true);
     }
-    listener.reportErrorMessage(spannable, errorCode, arguments);
+    reporter.reportErrorMessage(spannable, errorCode, arguments);
   }
 }