Attempt to load sdk.ds from the only embedder.

pkg/analyzer/lib/src/dart/sdk/sdk.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.generated.sdk2;
 
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io' as io;
 
@@ skipping 247 matching lines @@
 
 /**
  * An SDK backed by URI mappings derived from an `_embedder.yaml` file.
  */
 class EmbedderSdk extends AbstractDartSdk {
   static const String _DART_COLON_PREFIX = 'dart:';
 
   static const String _EMBEDDED_LIB_MAP_KEY = 'embedded_libs';
   final Map<String, String> _urlMappings = new HashMap<String, String>();
 
+  PackageBundle _embedderBundle;
+
   EmbedderSdk(
       ResourceProvider resourceProvider, Map<Folder, YamlMap> embedderYamls) {
     this.resourceProvider = resourceProvider;
     embedderYamls?.forEach(_processEmbedderYaml);
+    if (embedderYamls?.length == 1) {
+      Folder libFolder = embedderYamls.keys.first;
+      _loadEmbedderBundle(libFolder);
+    }
   }
 
   @override
   // TODO(danrubel) Determine SDK version
   String get sdkVersion => '0';
 
   /**
    * The url mappings for this SDK.
    */
   Map<String, String> get urlMappings => _urlMappings;
 
   @override
-  PackageBundle getLinkedBundle() => null;
-
-  @override
   String getRelativePathFromFile(File file) => file.path;
 
   @override
-  PackageBundle getSummarySdkBundle(bool strongMode) => null;
+  PackageBundle getSummarySdkBundle(bool strongMode) {
+    if (strongMode) {
+      return _embedderBundle;
+    }
+    return null;
+  }
 
   @override
   Source internalMapDartUri(String dartUri) {
     String libraryName;
     String relativePath;
     int index = dartUri.indexOf('/');
     if (index >= 0) {
       libraryName = dartUri.substring(0, index);
       relativePath = dartUri.substring(index + 1);
     } else {
@@ skipping 21 matching lines @@
     }
     String filePath = srcPath.replaceAll('/', separator);
     try {
       File file = resourceProvider.getFile(filePath);
       return file.createSource(parseUriWithException(dartUri));
     } on URISyntaxException {
       return null;
     }
   }
 
+  void _loadEmbedderBundle(Folder libFolder) {
+    File bundleFile = libFolder.parent.getChildAssumingFile('sdk.ds');
+    if (bundleFile.exists) {
+      try {
+        List<int> bytes = bundleFile.readAsBytesSync();
+        _embedderBundle = new PackageBundle.fromBuffer(bytes);
+      } on FileSystemException {}
+    }
+  }
+
   /**
    * Install the mapping from [name] to [libDir]/[file].
    */
   void _processEmbeddedLibs(String name, String file, Folder libDir) {
     if (!name.startsWith(_DART_COLON_PREFIX)) {
       // SDK libraries must begin with 'dart:'.
       return;
     }
     String libPath = libDir.canonicalizePath(file);
     _urlMappings[name] = libPath;
@@ skipping 502 matching lines @@
     SdkLibrariesReader_LibraryBuilder libraryBuilder =
         new SdkLibrariesReader_LibraryBuilder(_useDart2jsPaths);
     // If any syntactic errors were found then don't try to visit the AST
     // structure.
     if (!errorListener.errorReported) {
       unit.accept(libraryBuilder);
     }
     return libraryBuilder.librariesMap;
   }
 }