Split MessageKind into a MessageKind key and a MessageTemplate.

pkg/compiler/lib/src/dump_info.dart

Index: pkg/compiler/lib/src/dump_info.dart
diff --git a/pkg/compiler/lib/src/dump_info.dart b/pkg/compiler/lib/src/dump_info.dart
index 2524fb1812f075afb7562b39e12d89dd16ea7e6b..3b8f8bce2ae20e3e9706acfda1458e90fc9531bc 100644
--- a/pkg/compiler/lib/src/dump_info.dart
+++ b/pkg/compiler/lib/src/dump_info.dart
@@ -639,9 +639,10 @@ class DumpInfoTask extends CompilerTask {
       encoder.startChunkedConversion(
           new StringConversionSink.fromStringSink(buffer));
     sink.add(outJson);
-    compiler.reportInfo(NO_LOCATION_SPANNABLE,
-        const MessageKind(
-            "View the dumped .info.json file at "
-            "https://dart-lang.github.io/dump-info-visualizer"));
+    compiler.reportInfo(
+        NO_LOCATION_SPANNABLE,
+        MessageKind.GENERIC,
+        {'text': "View the dumped .info.json file at "
+                 "https://dart-lang.github.io/dump-info-visualizer"});
   }
 }