Connect analyzer's AnalysisError object to front_end's CompilationError.

pkg/analyzer/test/generated/test_support.dart

Index: pkg/analyzer/test/generated/test_support.dart
diff --git a/pkg/analyzer/test/generated/test_support.dart b/pkg/analyzer/test/generated/test_support.dart
index ce0b3f0af6ee8fe840f397c95103f2938d675e46..06f47e59679575e6c8cb194fea92fdf6c0942482 100644
--- a/pkg/analyzer/test/generated/test_support.dart
+++ b/pkg/analyzer/test/generated/test_support.dart
@@ -18,6 +18,7 @@ import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:plugin/manager.dart';
 import 'package:plugin/plugin.dart';
+import 'package:source_span/source_span.dart' as source_span;
 import 'package:test/test.dart';
 
 import 'analysis_context_factory.dart';
@@ -544,6 +545,8 @@ class TestSource extends Source {
   int _modificationStamp = 0;
   bool exists2 = true;
 
+  source_span.SourceFile _sourceFile;
+
   /**
    * A flag indicating whether an exception should be generated when an attempt
    * is made to access the contents of this source.
@@ -586,6 +589,10 @@ class TestSource extends Source {
     return _name;
   }
 
+  @override
+  source_span.SourceFile get sourceFile =>
+      _sourceFile ??= new source_span.SourceFile(_contents, url: uri);
+
   Uri get uri => new Uri.file(_name);
 
   UriKind get uriKind {