Precompute `IgnoreInfo` in Scanner.

pkg/analyzer/lib/task/general.dart

Index: pkg/analyzer/lib/task/general.dart
diff --git a/pkg/analyzer/lib/task/general.dart b/pkg/analyzer/lib/task/general.dart
index c40ff4c6be4cd92297dfbdc5b10d1fac3a65f5cb..9b33e870dd02bd814bfa598314013d8e2c8d4c55 100644
--- a/pkg/analyzer/lib/task/general.dart
+++ b/pkg/analyzer/lib/task/general.dart
@@ -14,6 +14,12 @@ final ResultDescriptor<String> CONTENT =
     new ResultDescriptor<String>('CONTENT', null);
 
 /**
+ * The ignore information for a [Source].
+ */
+final ResultDescriptor<IgnoreInfo> IGNORE_INFO =
+    new ResultDescriptor<IgnoreInfo>('IGNORE_INFO', null);

[scheglov, 2016/05/27 18:05:47]

Do we need this as a public information?

[Brian Wilkerson, 2016/05/27 18:21:18]

I'd make it an internal result until we find a reason to make it public.

[pquitslund, 2016/05/27 21:50:53]

Done.

+
+/**
  * The line information for a [Source].
  */
 final ResultDescriptor<LineInfo> LINE_INFO =