Add _embedder.yaml support to analyzer and analysis_server

pkg/analysis_server/test/context_manager_test.dart

Index: pkg/analysis_server/test/context_manager_test.dart
diff --git a/pkg/analysis_server/test/context_manager_test.dart b/pkg/analysis_server/test/context_manager_test.dart
index 0baa6fc079faf6effaeb53ab80b7fcedfbb32051..9c659c0ab6b90e0eaf1b9d6c2238922f2b9aba95 100644
--- a/pkg/analysis_server/test/context_manager_test.dart
+++ b/pkg/analysis_server/test/context_manager_test.dart
@@ -567,6 +567,49 @@ analyzer:
     });
   }
 
+  test_embedder_packagespec() async {
+    // Create files.
+    String libPath = newFolder([projPath, LIB_NAME]);
+    newFile([libPath, 'main.dart']);
+    newFile([libPath, 'nope.dart']);
+    String sdkExtPath = newFolder([projPath, 'sdk_ext']);
+    newFile([sdkExtPath, 'entry.dart']);
+    String sdkExtSrcPath = newFolder([projPath, 'sdk_ext', 'src']);
+    newFile([sdkExtSrcPath, 'part.dart']);
+    // Setup _embedder.yaml.
+    newFile(
+        [libPath, '_embedder.yaml'],
+        r'''
+embedder_libs:
+  "dart:foobar": "../sdk_ext/entry.dart"
+  "dart:typed_data": "../sdk_ext/src/part"
+  ''');
+    // Setup .packages file
+    newFile(
+        [projPath, '.packages'],
+        r'''
+test_pack:lib/''');
+    // Setup context.
+
+    manager.setRoots(<String>[projPath], <String>[], <String, String>{});
+    await pumpEventQueue();
+    // Confirm that one context was created.
+    var contexts =
+        manager.contextsInAnalysisRoot(resourceProvider.newFolder(projPath));
+    expect(contexts, isNotNull);
+    expect(contexts.length, equals(1));

[pquitslund, 2015/11/11 21:19:34]

[Nit]: can be simplified to:

expect(contexts.length, 1);

[Brian Wilkerson, 2015/11/11 22:09:14]

or, better yet:

expect(contexts, hasLength(1));

+    var context = contexts[0];
+    var source = context.sourceFactory.forUri('dart:foobar');
+    expect(source, isNotNull);
+    expect(source.fullName, equals('/my/proj/sdk_ext/entry.dart'));

[pquitslund, 2015/11/11 21:19:34]

[Nit]: can be simplified to:

expect(source.fullName, '/my/proj/sdk_ext/entry.dart');

+    // We can't find dart:core because we didn't list it in our
+    // embedder_libs map.
+    expect(context.sourceFactory.forUri('dart:core'), isNull);
+    // We can find dart:typed_data because we listed it in our
+    // embedder_libs map.
+    expect(context.sourceFactory.forUri('dart:typed_data'), isNotNull);
+  }
+
   test_sdk_ext_packagespec() async {
     // Create files.
     String libPath = newFolder([projPath, LIB_NAME]);
@@ -588,8 +631,7 @@ analyzer:
     newFile(
         [projPath, '.packages'],
         r'''
-test_pack:lib/
-''');
+test_pack:lib/''');
     // Setup context.
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     // Confirm that one context was created.