Introduce new constructor to PlatformThread.

webrtc/voice_engine/channel_proxy.cc

Index: webrtc/voice_engine/channel_proxy.cc
diff --git a/webrtc/voice_engine/channel_proxy.cc b/webrtc/voice_engine/channel_proxy.cc
index 4e690fb62f071d6483feb0d90d4de9d52a62964a..c1edb8bc296bae19254070e773e5b54985e3cf2b 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -154,8 +154,12 @@ bool ChannelProxy::SendTelephoneEventOutband(int event, int duration_ms) {
 }
 
 void ChannelProxy::SetBitrate(int bitrate_bps, int64_t probing_interval_ms) {
-  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread() ||
-             module_process_thread_checker_.CalledOnValidThread());
+  // This method can be called on the worker thread, module process thread
+  // or on a TaskQueue via VideoSendStreamImpl::OnEncoderConfigurationChanged.
+  // TODO(solenberg): Figure out a good way to check this or enforce calling
+  // rules.
+  // RTC_DCHECK(worker_thread_checker_.CalledOnValidThread() ||
+  //            module_process_thread_checker_.CalledOnValidThread());
   channel()->SetBitRate(bitrate_bps, probing_interval_ms);
 }