Changing SpawnChild to return a struct.

base/android/global_object_registry.cc

Index: base/android/global_object_registry.cc
diff --git a/base/android/global_object_registry.cc b/base/android/global_object_registry.cc
new file mode 100644
index 0000000000000000000000000000000000000000..371bb0374f95597f9cc631f692260dac36ee0d71
--- /dev/null
+++ b/base/android/global_object_registry.cc
@@ -0,0 +1,35 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/android/global_object_registry.h"
+
+namespace base {
+namespace android {
+
+GlobalObjectRegistry::GlobalObjectRegistry() {}
+// static
+GlobalObjectRegistry* GlobalObjectRegistry::GetInstance() {
+  static GlobalObjectRegistry* instance;
+  if (!instance)
+    instance = new GlobalObjectRegistry();
+  return instance;
+}
+
+void GlobalObjectRegistry::Set(Key key, const JavaRef<jobject>& java_object) {
+  DCHECK(mappings_.find(key) == mappings_.end());
+  mappings_[key] = ScopedJavaGlobalRef<jobject>(java_object);
+}
+
+ScopedJavaLocalRef<jobject> GlobalObjectRegistry::Take(Key key) {
+  auto iter = mappings_.find(key);
+  if (iter == mappings_.end())
+    return ScopedJavaLocalRef<jobject>();
+
+  ScopedJavaLocalRef<jobject> result(iter->second);
+  mappings_.erase(iter);
+  return result;
+}
+
+}  // namespace android
+}  // namespace base