Use continual gathering to restore backup connections

webrtc/p2p/base/portallocator.h

Index: webrtc/p2p/base/portallocator.h
diff --git a/webrtc/p2p/base/portallocator.h b/webrtc/p2p/base/portallocator.h
index 7d2a59f278ccb307ce0266ef89f65234eb291768..93c3352d18e73fe46fda90c483686d188f7b8df7 100644
--- a/webrtc/p2p/base/portallocator.h
+++ b/webrtc/p2p/base/portallocator.h
@@ -23,6 +23,11 @@
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/thread.h"
 
+namespace rtc {
+class Network;
+class NetworkManager;
+}  // namespace rtc
+
 namespace cricket {
 
 // PortAllocator is responsible for allocating Port types for a given
@@ -165,6 +170,9 @@ class PortAllocatorSession : public sigslot::has_slots<> {
   virtual void ClearGettingPorts() = 0;
   // Whether the process of getting ports has been stopped.
   virtual bool IsGettingPorts() = 0;
+  // Get ports and re-gather candidates on the given networks.
+  // If |networks| is nullptr, get ports and candidates on all networks.
+  virtual void GetPortsOnNetworks(const std::vector<rtc::Network*>* networks) {}

[pthatcher1, 2016/06/07 18:54:34]

I think this would be more clear with two methods:

virtual void RegatherAllNetworks()
virtual void RegatherNetworks(const std::vector<rtc::Network*>& networks)

 
   // Another way of getting the information provided by the signals below.
   //
@@ -172,6 +180,8 @@ class PortAllocatorSession : public sigslot::has_slots<> {
   // signals were emitted in.
   virtual std::vector<PortInterface*> ReadyPorts() const = 0;
   virtual std::vector<Candidate> ReadyCandidates() const = 0;
+  // Returns the sanitized candidates on |port|.
+  virtual std::vector<Candidate> ReadyCandidates(PortInterface* port) const = 0;
   virtual bool CandidatesAllocationDone() const = 0;
 
   sigslot::signal2<PortAllocatorSession*, PortInterface*> SignalPortReady;
@@ -263,6 +273,8 @@ class PortAllocator : public sigslot::has_slots<> {
   // loopback interfaces.
   virtual void SetNetworkIgnoreMask(int network_ignore_mask) = 0;
 
+  virtual rtc::NetworkManager* network_manager() const = 0;

[pthatcher1, 2016/06/07 18:54:34]

***

+
   std::unique_ptr<PortAllocatorSession> CreateSession(
       const std::string& sid,
       const std::string& content_name,