Reland of Adding the ability to change ICE servers through SetConfiguration.

talk/app/webrtc/fakeportallocatorfactory.h

 /*
  * libjingle
  * Copyright 2011 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 31 matching lines @@
     rtc::RefCountedObject<FakePortAllocatorFactory>* allocator =
           new rtc::RefCountedObject<FakePortAllocatorFactory>();
     return allocator;
   }
 
   virtual cricket::PortAllocator* CreatePortAllocator(
       const std::vector<StunConfiguration>& stun_configurations,
       const std::vector<TurnConfiguration>& turn_configurations) {
     stun_configs_ = stun_configurations;
     turn_configs_ = turn_configurations;
-    return new cricket::FakePortAllocator(rtc::Thread::Current(), NULL);
+    last_created_allocator_ =
+        new cricket::FakePortAllocator(rtc::Thread::Current(), nullptr);
+    return last_created_allocator_;
   }
 
   const std::vector<StunConfiguration>& stun_configs() const {
     return stun_configs_;
   }
 
   const std::vector<TurnConfiguration>& turn_configs() const {
     return turn_configs_;
   }
 
   void SetNetworkIgnoreMask(int network_ignore_mask) {}
 
+  // Up to caller to ensure this isn't called after the allocator has been
+  // destroyed.
+  cricket::FakePortAllocator* last_created_allocator() {
+    return last_created_allocator_;
+  }
+
  protected:
   FakePortAllocatorFactory() {}
   ~FakePortAllocatorFactory() {}
 
  private:
   std::vector<PortAllocatorFactoryInterface::StunConfiguration> stun_configs_;
   std::vector<PortAllocatorFactoryInterface::TurnConfiguration> turn_configs_;
+  cricket::FakePortAllocator* last_created_allocator_ = nullptr;
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_FAKEPORTALLOCATORFACTORY_H_