Implement continue for switch.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index 7e1beaa95326184c87cde3d991cae127e5122ab5..26a0f760e49f077814a62394a33b6769f73c1b3d 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -2715,10 +2715,6 @@ class ResolverVisitor extends MappingVisitor<Element> {
       if (!target.statement.isValidContinueTarget()) {
         error(node.target, MessageKind.INVALID_CONTINUE);
       }
-      // TODO(lrn): Handle continues to switch cases.
-      if (target.statement is SwitchCase) {
-        unimplemented(node, "continue to switch case");
-      }
       label.setContinueTarget();
       mapping[node.target] = label;
     }
@@ -2898,19 +2894,8 @@ class ResolverVisitor extends MappingVisitor<Element> {
           }
         }
 
-        TargetElement targetElement =
-            new TargetElementX(switchCase,
-                               statementScope.nestingLevel,
-                               enclosingElement);
-        if (mapping[switchCase] != null) {
-          // TODO(ahe): Talk to Lasse about this.
-          mapping.remove(switchCase);
-        }
-        mapping[switchCase] = targetElement;
-
-        LabelElement labelElement =
-            new LabelElementX(label, labelName,
-                              targetElement, enclosingElement);
+        TargetElement targetElement = getOrCreateTargetElement(switchCase);
+        LabelElement labelElement = targetElement.addLabel(label, labelName);
         mapping[label] = labelElement;
         continueLabels[labelName] = labelElement;
       }