Check the return value of Platform::current()->currentThread() for media_blink_unittests.

Source/platform/Timer.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * 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
@@ skipping 28 matching lines @@
 #include <limits>
 #include <math.h>
 
 namespace blink {
 
 TimerBase::TimerBase()
     : m_nextFireTime(0)
     , m_unalignedNextFireTime(0)
     , m_repeatInterval(0)
     , m_cancellableTimerTask(nullptr)
-    , m_webScheduler(Platform::current()->currentThread()->scheduler())
+    , m_webScheduler(Platform::current()->currentThread() ? Platform::current()->currentThread()->scheduler() : nullptr)
 #if ENABLE(ASSERT)
     , m_thread(currentThread())
 #endif
 {
 }
 
 TimerBase::~TimerBase()
 {
     stop();
 }
@@ skipping 37 matching lines @@
     if (m_nextFireTime != newTime) {
         m_nextFireTime = newTime;
         // Round the delay up to the nearest millisecond to be consistant with the
         // previous behavior of BlinkPlatformImpl::setSharedTimerFireInterval.
         long long delayMs = static_cast<long long>(ceil((newTime - now) * 1000.0));
         if (delayMs < 0)
             delayMs = 0;
         if (m_cancellableTimerTask)
             m_cancellableTimerTask->cancel();
         m_cancellableTimerTask = new CancellableTimerTask(this);
-        m_webScheduler->postTimerTask(m_location, m_cancellableTimerTask, delayMs);
+        if (m_webScheduler)
+            m_webScheduler->postTimerTask(m_location, m_cancellableTimerTask, delayMs);
     }
 }
 
 NO_LAZY_SWEEP_SANITIZE_ADDRESS
 void TimerBase::runInternal()
 {
     if (!canFire())
         return;
 
     TRACE_EVENT0("blink", "TimerBase::run");
@@ skipping 14 matching lines @@
     setNextFireTime(now, m_unalignedNextFireTime - now);
 }
 
 double TimerBase::nextUnalignedFireInterval() const
 {
     ASSERT(isActive());
     return std::max(m_unalignedNextFireTime - monotonicallyIncreasingTime(), 0.0);
 }
 
 } // namespace blink