Update VirtualSocketServerTest to use a fake clock.

webrtc/base/timeutils.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 21 matching lines @@
 namespace rtc {
 
 ClockInterface* g_clock = nullptr;
 
 ClockInterface* SetClockForTesting(ClockInterface* clock) {
   ClockInterface* prev = g_clock;
   g_clock = clock;
   return prev;
 }
 
+ClockInterface* GetClockForTesting() {
+  return g_clock;
+}
+
 int64_t SystemTimeNanos() {
   int64_t ticks;
 #if defined(WEBRTC_MAC)
   static mach_timebase_info_data_t timebase;
   if (timebase.denom == 0) {
     // Get the timebase if this is the first time we run.
     // Recommended by Apple's QA1398.
     if (mach_timebase_info(&timebase) != KERN_SUCCESS) {
       RTC_NOTREACHED();
     }
@@ skipping 145 matching lines @@
 #elif defined(WEBRTC_WIN)
   struct _timeb time;
   _ftime(&time);
   // Convert from second (1.0) and milliseconds (1e-3).
   return (static_cast<int64_t>(time.time) * rtc::kNumMicrosecsPerSec +
           static_cast<int64_t>(time.millitm) * rtc::kNumMicrosecsPerMillisec);
 #endif
 }
 
 } // namespace rtc