Initial Bazel file resolver support.

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index 5b418ea89ea3575b46a8f1e5cbf065a1e24e4aa7..6f07c1f06456d996d3dbac8ad7d9a3db1d2fa438 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -11,6 +11,7 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
+import 'package:analyzer/plugin/resolver_provider.dart';
 import 'package:analyzer/plugin/task.dart';
 import 'package:analyzer/source/embedder.dart';
 import 'package:analyzer/src/cancelable_future.dart';
@@ -228,6 +229,9 @@ class AnalysisContextImpl implements InternalAnalysisContext {
    */
   CompilationUnit incrementalResolutionValidation_lastUnit;
 
+  @override
+  ResolverProvider fileResolverProvider;
+
   /**
    * Initialize a newly created analysis context.
    */