Bind a socket to a network if the network handle is set.

webrtc/base/networkmonitor.cc

Index: webrtc/base/networkmonitor.cc
diff --git a/webrtc/base/networkmonitor.cc b/webrtc/base/networkmonitor.cc
index 92bf0592b5fa3932b243968c93b3759c1e93365d..63e92f51227486875a795680ed09af72a4411afa 100644
--- a/webrtc/base/networkmonitor.cc
+++ b/webrtc/base/networkmonitor.cc
@@ -26,11 +26,17 @@ NetworkMonitorInterface::NetworkMonitorInterface() {}
 
 NetworkMonitorInterface::~NetworkMonitorInterface() {}
 
-NetworkMonitorBase::NetworkMonitorBase() : thread_(Thread::Current()) {}
+NetworkMonitorBase::NetworkMonitorBase() : thread_(nullptr) {}
 NetworkMonitorBase::~NetworkMonitorBase() {}
 
+void NetworkMonitorBase::Start() {

[pthatcher1, 2016/01/14 20:07:24]

Should we check to make sure Start() isn't called more than once?

[honghaiz3, 2016/01/15 01:00:38]

Removed this change. 

+  if (thread_ == nullptr) {
+    thread_ = Thread::Current();
+  }
+}
 void NetworkMonitorBase::OnNetworksChanged() {
   LOG(LS_VERBOSE) << "Network change is received at the network monitor";
+  ASSERT(thread_ != nullptr);
   thread_->Post(this, UPDATE_NETWORKS_MESSAGE);
 }