Find diagnostic locations for use in new compiler API.

dart/frog/leg/apiimpl.dart

Index: dart/frog/leg/apiimpl.dart
diff --git a/dart/frog/leg/apiimpl.dart b/dart/frog/leg/apiimpl.dart
index 6b29e5c4b9f4c20bf16c8ad077525db1025166c9..98604e4cd54ea7ddac06dabd4246f8dbc3314865 100644
--- a/dart/frog/leg/apiimpl.dart
+++ b/dart/frog/leg/apiimpl.dart
@@ -22,10 +22,6 @@ class Compiler extends leg.Compiler {
     return library;
   }
 
-  void log(message) {
-    handler(null, null, null, message, false);
-  }
-
   Script readScript(Uri uri, [ScriptTag node]) {
     String uriName = uri.toString();
     // TODO(ahe): Clean this up.
@@ -55,4 +51,9 @@ class Compiler extends leg.Compiler {
     }
     return success;
   }
+
+  void reportDiagnostic(Uri uri, int begin, int end,
+                        String message, bool fatal) {
+    handler(uri, begin, end, message, fatal);
+  }
 }