Create summary files in MockSdk classes

pkg/analysis_server/test/mock_sdk.dart

Index: pkg/analysis_server/test/mock_sdk.dart
diff --git a/pkg/analysis_server/test/mock_sdk.dart b/pkg/analysis_server/test/mock_sdk.dart
index acb2095fc0c39442962eed293fd83d9699eaa983..bd12211376a2e221f1820c5b83fc13ea93f45653 100644
--- a/pkg/analysis_server/test/mock_sdk.dart
+++ b/pkg/analysis_server/test/mock_sdk.dart
@@ -274,8 +274,15 @@ const Map<String, LibraryInfo> libraries = const {
     LIBRARIES.forEach((SdkLibrary library) {
       provider.newFile(library.path, (library as MockSdkLibrary).content);
     });
-    provider.newFile('/lib/_internal/sdk_library_metadata/lib/libraries.dart',
+    provider.newFile(
+        provider.convertPath(
+            '/lib/_internal/sdk_library_metadata/lib/libraries.dart'),
         librariesContent);
+    List<int> bytes = _computeLinkedBundleBytes();
+    provider.newFileWithBytes(
+        provider.convertPath('/lib/_internal/spec.sum'), bytes);
+    provider.newFileWithBytes(
+        provider.convertPath('/lib/_internal/strong.sum'), bytes);
   }
 
   @override
@@ -341,13 +348,7 @@ const Map<String, LibraryInfo> libraries = const {
   @override
   PackageBundle getLinkedBundle() {
     if (_bundle == null) {
-      List<Source> librarySources = sdkLibraries
-          .map((SdkLibrary library) => mapDartUri(library.shortName))
-          .toList();
-      List<int> bytes = new SummaryBuilder(
-              librarySources, context, context.analysisOptions.strongMode)
-          .build();
-      _bundle = new PackageBundle.fromBuffer(bytes);
+      _bundle = new PackageBundle.fromBuffer(_computeLinkedBundleBytes());

[scheglov, 2016/12/02 01:15:52]

If we already have these bytes in the file system, it would be cheaper to read
them than to build again.

[Brian Wilkerson, 2016/12/02 15:32:04]

Probably so, but when I tried to use the stored bytes one of the tests started
failing (PubSummaryManagerTest | test_getLinkedBundles_cached_differentSdk).
Therefore, I'm going to leave the optimization to a later CL.

     }
     return _bundle;
   }
@@ -383,6 +384,18 @@ const Map<String, LibraryInfo> libraries = const {
     // table above.
     return null;
   }
+
+  /**
+   * Compute the bytes in the linked bundle associated with this SDK.
+   */
+  List<int> _computeLinkedBundleBytes() {
+    List<Source> librarySources = sdkLibraries
+        .map((SdkLibrary library) => mapDartUri(library.shortName))
+        .toList();
+    return new SummaryBuilder(
+            librarySources, context, context.analysisOptions.strongMode)
+        .build();
+  }
 }
 
 class MockSdkLibrary implements SdkLibrary {