- Add a minimal implementation of Capability.

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
===================================================================
--- runtime/vm/raw_object_snapshot.cc	(revision 35287)
+++ runtime/vm/raw_object_snapshot.cc	(working copy)
@@ -2512,6 +2512,72 @@
 #undef EXT_TYPED_DATA_WRITE
 
 
+RawCapability* Capability::ReadFrom(SnapshotReader* reader,
+                                    intptr_t object_id,
+                                    intptr_t tags,
+                                    Snapshot::Kind kind) {
+  UNIMPLEMENTED();
+  return Capability::null();
+}
+
+
+void RawCapability::WriteTo(SnapshotWriter* writer,
+                            intptr_t object_id,
+                            Snapshot::Kind kind) {
+  UNIMPLEMENTED();
+}
+
+
+RawReceivePort* ReceivePort::ReadFrom(SnapshotReader* reader,
+                                      intptr_t object_id,
+                                      intptr_t tags,
+                                      Snapshot::Kind kind) {
+  UNREACHABLE();
+  return ReceivePort::null();
+}
+
+
+void RawReceivePort::WriteTo(SnapshotWriter* writer,
+                             intptr_t object_id,
+                             Snapshot::Kind kind) {
+  if (kind == Snapshot::kMessage) {
+    // We do not allow objects with native fields in an isolate message.
+    writer->SetWriteException(Exceptions::kArgument,
+                              "Illegal argument in isolate message"
+                              " : (object is a RawReceivePort)");
+  } else {
+    UNREACHABLE();
+  }
+}
+
+
+RawSendPort* SendPort::ReadFrom(SnapshotReader* reader,
+                                intptr_t object_id,
+                                intptr_t tags,
+                                Snapshot::Kind kind) {
+  uint64_t id = reader->Read<uint64_t>();
+
+  SendPort& result = SendPort::ZoneHandle(reader->isolate(),
+                                          SendPort::New(id));
+  reader->AddBackRef(object_id, &result, kIsDeserialized);
+  return result.raw();
+}
+
+
+void RawSendPort::WriteTo(SnapshotWriter* writer,
+                          intptr_t object_id,
+                          Snapshot::Kind kind) {
+  // Write out the serialization header value for this object.
+  writer->WriteInlinedObjectHeader(object_id);
+
+  // Write out the class and tags information.
+  writer->WriteIndexedObject(kSendPortCid);
+  writer->WriteIntptrValue(writer->GetObjectTags(this));
+
+  writer->Write(ptr()->id_);
+}
+
+
 RawStacktrace* Stacktrace::ReadFrom(SnapshotReader* reader,
                                     intptr_t object_id,
                                     intptr_t tags,