Expose Service Describer in Dart mojo package

mojo/dart/packages/mojo_services/lib/tracing/tracing.mojom.dart

Index: mojo/dart/packages/mojo_services/lib/tracing/tracing.mojom.dart
diff --git a/mojo/dart/packages/mojo_services/lib/tracing/tracing.mojom.dart b/mojo/dart/packages/mojo_services/lib/tracing/tracing.mojom.dart
index 5fe70c585c645e41b459463ba5ca3148d98585c8..969732067bde01fd191f7e780eeca056118ee51c 100644
--- a/mojo/dart/packages/mojo_services/lib/tracing/tracing.mojom.dart
+++ b/mojo/dart/packages/mojo_services/lib/tracing/tracing.mojom.dart
@@ -385,11 +385,14 @@ const int _TraceProvider_stopTracingName = 1;
 
 
 class _TraceProviderServiceDescription implements service_describer.ServiceDescription {
-  dynamic getTopLevelInterface([Function responseFactory]) => null;
+  dynamic getTopLevelInterface([Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) => null;
+  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getAllTypeDefinitions([Function responseFactory]) => null;
+  dynamic getAllTypeDefinitions([Function responseFactory]) =>
+      responseFactory(null);
 }
 
 abstract class TraceProvider {
@@ -575,7 +578,7 @@ class TraceProviderStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _TraceProviderServiceDescription();
 }
 
@@ -584,11 +587,14 @@ const int _TraceRecorder_recordName = 0;
 
 
 class _TraceRecorderServiceDescription implements service_describer.ServiceDescription {
-  dynamic getTopLevelInterface([Function responseFactory]) => null;
+  dynamic getTopLevelInterface([Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) => null;
+  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getAllTypeDefinitions([Function responseFactory]) => null;
+  dynamic getAllTypeDefinitions([Function responseFactory]) =>
+      responseFactory(null);
 }
 
 abstract class TraceRecorder {
@@ -759,7 +765,7 @@ class TraceRecorderStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _TraceRecorderServiceDescription();
 }
 
@@ -769,11 +775,14 @@ const int _TraceCollector_stopAndFlushName = 1;
 
 
 class _TraceCollectorServiceDescription implements service_describer.ServiceDescription {
-  dynamic getTopLevelInterface([Function responseFactory]) => null;
+  dynamic getTopLevelInterface([Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) => null;
+  dynamic getTypeDefinition(String typeKey, [Function responseFactory]) =>
+      responseFactory(null);
 
-  dynamic getAllTypeDefinitions([Function responseFactory]) => null;
+  dynamic getAllTypeDefinitions([Function responseFactory]) =>
+      responseFactory(null);
 }
 
 abstract class TraceCollector {
@@ -959,7 +968,7 @@ class TraceCollectorStub extends bindings.Stub {
 
   int get version => 0;
 
-  service_describer.ServiceDescription get serviceDescription =>
+  static service_describer.ServiceDescription get serviceDescription =>
     new _TraceCollectorServiceDescription();
 }