Add copyright and fix include guards.

src/core/lib/iomgr/eventmanager_interface.h

@@ -1,18 +0,0 @@
-#ifndef GRPC_CORE_LIB_IOMGR_POLLER_EVENTMANAGER_INTERFACE_H_
-#define GRPC_CORE_LIB_IOMGR_POLLER_EVENTMANAGER_INTERFACE_H_
-
-namespace grpc {
-
-namespace experimental {
-
-class BaseEventManagerInterface {
- public:
-  virtual ~BaseEventManagerInterface() {}
-};
-
-class EpollEventManagerInterface : public BaseEventManagerInterface {};
-
-}  // namespace experimental
-}  // namespace grpc
-
-#endif  // GRPC_CORE_LIB_IOMGR_POLLER_EVENTMANAGER_INTERFACE_H_

src/core/lib/iomgr/poller/eventmanager_interface.h

@@ -0,0 +1,36 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_IOMGR_POLLER_EVENTMANAGER_INTERFACE_H_
+#define GRPC_CORE_LIB_IOMGR_POLLER_EVENTMANAGER_INTERFACE_H_
+
+namespace grpc {
+
+namespace experimental {
+
+class BaseEventManagerInterface {
+ public:
+  virtual ~BaseEventManagerInterface() {}
+};
+
+class EpollEventManagerInterface : public BaseEventManagerInterface {};
+
+}  // namespace experimental
+}  // namespace grpc
+
+#endif  // GRPC_CORE_LIB_IOMGR_POLLER_EVENTMANAGER_INTERFACE_H_