When using clang, switch on -Wc++11-narrowing

webrtc/rtc_base/task_queue_libevent.cc

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/rtc_base/task_queue.h"
 
 #include <fcntl.h>
 #include <signal.h>
 #include <string.h>
 #include <unistd.h>
 
 #include "base/third_party/libevent/event.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/logging.h"
+#include "webrtc/rtc_base/safe_conversions.h"
 #include "webrtc/rtc_base/task_queue_posix.h"
 #include "webrtc/rtc_base/timeutils.h"
 
 namespace rtc {
 using internal::GetQueuePtrTls;
 using internal::AutoSetCurrentQueuePtr;
 
 namespace {
 static const char kQuit = 1;
 static const char kRunTask = 2;
@@ skipping 279 matching lines @@
 }
 
 void TaskQueue::PostDelayedTask(std::unique_ptr<QueuedTask> task,
                                 uint32_t milliseconds) {
   if (IsCurrent()) {
     TimerEvent* timer = new TimerEvent(std::move(task));
     EventAssign(&timer->ev, event_base_, -1, 0, &TaskQueue::RunTimer, timer);
     QueueContext* ctx =
         static_cast<QueueContext*>(pthread_getspecific(GetQueuePtrTls()));
     ctx->pending_timers_.push_back(timer);
-    timeval tv = {milliseconds / 1000, (milliseconds % 1000) * 1000};
+    timeval tv = {rtc::dchecked_cast<int>(milliseconds / 1000),
+                  rtc::dchecked_cast<int>(milliseconds % 1000) * 1000};
     event_add(&timer->ev, &tv);
   } else {
     PostTask(std::unique_ptr<QueuedTask>(
         new SetTimerTask(std::move(task), milliseconds)));
   }
 }
 
 void TaskQueue::PostTaskAndReply(std::unique_ptr<QueuedTask> task,
                                  std::unique_ptr<QueuedTask> reply,
                                  TaskQueue* reply_queue) {
@@ skipping 89 matching lines @@
   delete timer;
 }
 
 void TaskQueue::PrepareReplyTask(scoped_refptr<ReplyTaskOwnerRef> reply_task) {
   RTC_DCHECK(reply_task);
   CritScope lock(&pending_lock_);
   pending_replies_.push_back(std::move(reply_task));
 }
 
 }  // namespace rtc