Support for parsing HTML in the new task model

pkg/analyzer/test/src/context/abstract_context.dart

Index: pkg/analyzer/test/src/context/abstract_context.dart
diff --git a/pkg/analyzer/test/src/context/abstract_context.dart b/pkg/analyzer/test/src/context/abstract_context.dart
index a4a374fb7ecf3e546acdebaa501cd6daaf8a4d53..4c8f4a25c08d51836264ef465b81dc8fc13f6b5a 100644
--- a/pkg/analyzer/test/src/context/abstract_context.dart
+++ b/pkg/analyzer/test/src/context/abstract_context.dart
@@ -14,6 +14,7 @@ import 'package:analyzer/src/generated/engine.dart'
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/driver.dart';
+import 'package:analyzer/task/model.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mock_sdk.dart';
@@ -27,6 +28,10 @@ class AbstractContextTest {
   AnalysisCache analysisCache;
   AnalysisDriver analysisDriver;
 
+  AnalysisTask task;
+  Map<ResultDescriptor<dynamic>, dynamic> oldOutputs;
+  Map<ResultDescriptor<dynamic>, dynamic> outputs;
+
   Source addSource(String path, String contents) {
     Source source = newSource(path, contents);
     ChangeSet changeSet = new ChangeSet();
@@ -64,6 +69,17 @@ class AbstractContextTest {
     expect(elements, hasLength(names.length));
   }
 
+  /**
+   * Compute the given [result] for the given [target].
+   */
+  void computeResult(AnalysisTarget target, ResultDescriptor result) {
+    oldOutputs = outputs;
+    task = analysisDriver.computeResult(target, result);
+    expect(task, isNotNull);
+    expect(task.caughtException, isNull);
+    outputs = task.outputs;
+  }
+
   AnalysisContextImpl createAnalysisContext() {
     return new AnalysisContextImpl();
   }