Time conversion utility for EventEngine::Durations (#30427)

* Time conversion utility for EventEngine::Durations

* Automated change: Fix sanity tests

Co-authored-by: drfloob <drfloob@users.noreply.github.com>

BUILD

@@ -2251,6 +2251,16 @@ grpc_cc_library(
     ],
 )
 
+grpc_cc_library(
+    name = "event_engine_time_util",
+    srcs = ["src/core/lib/event_engine/time_util.cc"],
+    hdrs = ["src/core/lib/event_engine/time_util.h"],
+    deps = [
+        "event_engine_base_hdrs",
+        "gpr_platform",
+    ],
+)
+
 grpc_cc_library(
     name = "iomgr_ee_timer",
     srcs = [

src/core/lib/event_engine/time_util.cc

@@ -0,0 +1,30 @@
+// Copyright 2022 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.
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/event_engine/time_util.h"
+
+#include <chrono>
+
+#include <grpc/event_engine/event_engine.h>
+
+namespace grpc_event_engine {
+namespace experimental {
+
+int64_t Milliseconds(EventEngine::Duration d) {
+  return std::chrono::duration_cast<std::chrono::milliseconds>(d).count();
+}
+
+}  // namespace experimental
+}  // namespace grpc_event_engine

src/core/lib/event_engine/time_util.h

@@ -0,0 +1,32 @@
+// Copyright 2022 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_EVENT_ENGINE_TIME_UTIL_H
+#define GRPC_CORE_LIB_EVENT_ENGINE_TIME_UTIL_H
+
+#include <grpc/support/port_platform.h>
+
+#include <stdint.h>
+
+#include <grpc/event_engine/event_engine.h>
+
+namespace grpc_event_engine {
+namespace experimental {
+
+// Convert a duration to milliseconds
+int64_t Milliseconds(EventEngine::Duration d);
+
+}  // namespace experimental
+}  // namespace grpc_event_engine
+
+#endif  // GRPC_CORE_LIB_EVENT_ENGINE_TIME_UTIL_H