Hooks for injecting embedder resolver providers.

pkg/analyzer_cli/lib/src/driver.dart

Index: pkg/analyzer_cli/lib/src/driver.dart
diff --git a/pkg/analyzer_cli/lib/src/driver.dart b/pkg/analyzer_cli/lib/src/driver.dart
index 30547e60e48e61bcadfc1ba654ffb786abffde15..58e43596ef96577b97554ecefdd204c4adfa6cea 100644
--- a/pkg/analyzer_cli/lib/src/driver.dart
+++ b/pkg/analyzer_cli/lib/src/driver.dart
@@ -10,6 +10,7 @@ import 'dart:io';
 
 import 'package:analyzer/file_system/file_system.dart' as fileSystem;
 import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/plugin/embedded_resolver_provider.dart';
 import 'package:analyzer/plugin/options.dart';
 import 'package:analyzer/plugin/resolver_provider.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
@@ -82,6 +83,9 @@ class Driver implements CommandLineStarter {
   CommandLineOptions _previousOptions;
 
   @override
+  EmbeddedResolverProvider embeddedUriResolverProvider;
+
+  @override
   ResolverProvider packageResolverProvider;
 
   /// This Driver's current analysis context.
@@ -320,9 +324,23 @@ class Driver implements CommandLineStarter {
           PhysicalResourceProvider.INSTANCE.getResource('.');
       UriResolver resolver = packageResolverProvider(folder);
       if (resolver != null) {
-        // TODO(brianwilkerson) This doesn't support either embedder files or sdk extensions.
+        UriResolver sdkResolver;
+
+        // Check for a resolver provider.
+        if (embeddedUriResolverProvider != null) {
+          EmbedderUriResolver embedderUriResolver =
+              embeddedUriResolverProvider(folder);
+          if (embedderUriResolver != null && embedderUriResolver.length != 0) {
+            sdkResolver = embedderUriResolver;
+          }
+        }
+
+        // Default to a Dart URI resolver if no embedder is found.
+        sdkResolver ??= new DartUriResolver(sdk);
+
+        // TODO(brianwilkerson) This doesn't sdk extensions.
         List<UriResolver> resolvers = <UriResolver>[
-          new DartUriResolver(sdk),
+          sdkResolver,
           resolver,
           new FileUriResolver()
         ];