Test refactors to allow for delaying response trailers.

net/tools/quic/test_tools/server_thread.h

Index: net/tools/quic/test_tools/server_thread.h
diff --git a/net/tools/quic/test_tools/server_thread.h b/net/tools/quic/test_tools/server_thread.h
index 898679dae4ceeffefd87b366858f25166dcac61f..3fecb06485addbbfd94fbf4079ec6ed8474ddf6e 100644
--- a/net/tools/quic/test_tools/server_thread.h
+++ b/net/tools/quic/test_tools/server_thread.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "base/synchronization/lock.h"
 #include "base/threading/simple_thread.h"
 #include "net/base/ip_endpoint.h"
 #include "net/quic/core/quic_config.h"
@@ -32,6 +33,9 @@ class ServerThread : public base::SimpleThread {
   // Runs the event loop. Will initialize if necessary.
   void Run() override;
 
+  // Schedules the given action for execution in the event loop.
+  void Schedule(std::function<void()> action);
+
   // Waits for the handshake to be confirmed for the first session created.
   void WaitForCryptoHandshakeConfirmed();
 
@@ -57,6 +61,7 @@ class ServerThread : public base::SimpleThread {
 
  private:
   void MaybeNotifyOfHandshakeConfirmation();
+  void ExecuteScheduledActions();
 
   base::WaitableEvent confirmed_;  // Notified when the first handshake is
                                    // confirmed.
@@ -72,6 +77,9 @@ class ServerThread : public base::SimpleThread {
 
   bool initialized_;
 
+  base::Lock scheduled_actions_lock_;
+  std::deque<std::function<void()>> scheduled_actions_;
+
   DISALLOW_COPY_AND_ASSIGN(ServerThread);
 };