Propagate types of final/const top-level variables and fields.

pkg/analyzer/lib/src/plugin/engine_plugin.dart

Index: pkg/analyzer/lib/src/plugin/engine_plugin.dart
diff --git a/pkg/analyzer/lib/src/plugin/engine_plugin.dart b/pkg/analyzer/lib/src/plugin/engine_plugin.dart
index a067dcc766acb799e87706fb476faaac496e5a94..39d78c2e2144456c377e29c76a283383e808e0e2 100644
--- a/pkg/analyzer/lib/src/plugin/engine_plugin.dart
+++ b/pkg/analyzer/lib/src/plugin/engine_plugin.dart
@@ -197,6 +197,8 @@ class EnginePlugin implements Plugin {
     registerExtension(
         taskId, ComputeInferableStaticVariableDependenciesTask.DESCRIPTOR);
     registerExtension(taskId, ComputeLibraryCycleTask.DESCRIPTOR);
+    registerExtension(
+        taskId, ComputePropagableVariableDependenciesTask.DESCRIPTOR);
     registerExtension(taskId, ContainingLibrariesTask.DESCRIPTOR);
     registerExtension(taskId, DartErrorsTask.DESCRIPTOR);
     registerExtension(taskId, EvaluateUnitConstantsTask.DESCRIPTOR);
@@ -211,6 +213,8 @@ class EnginePlugin implements Plugin {
     registerExtension(taskId, LibraryUnitErrorsTask.DESCRIPTOR);
     registerExtension(taskId, ParseDartTask.DESCRIPTOR);
     registerExtension(taskId, PartiallyResolveUnitReferencesTask.DESCRIPTOR);
+    registerExtension(taskId, PropagateVariableTypesInUnitTask.DESCRIPTOR);
+    registerExtension(taskId, PropagateVariableTypeTask.DESCRIPTOR);
     registerExtension(taskId, ReadyLibraryElement2Task.DESCRIPTOR);
     registerExtension(taskId, ReadyLibraryElement5Task.DESCRIPTOR);
     registerExtension(taskId, ReadyResolvedUnitTask.DESCRIPTOR);