Patch 2/3 to get WebScheduler via WebThread

Source/platform/ThreadTimers.cpp

Index: Source/platform/ThreadTimers.cpp
diff --git a/Source/platform/ThreadTimers.cpp b/Source/platform/ThreadTimers.cpp
index e6cbcf064336741194fc24295aa89daa114d2961..7755ce23fa36753e9c8c842322975703fc504039 100644
--- a/Source/platform/ThreadTimers.cpp
+++ b/Source/platform/ThreadTimers.cpp
@@ -31,7 +31,8 @@
 #include "platform/SharedTimer.h"
 #include "platform/Timer.h"
 #include "platform/TraceEvent.h"
-#include "platform/scheduler/Scheduler.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebScheduler.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/MainThread.h"
 
@@ -136,7 +137,8 @@ void ThreadTimers::sharedTimerFiredInternal()
         timer.fired();
 
         // Catch the case where the timer asked timers to fire in a nested event loop, or we are over time limit.
-        if (!m_firingTimers || timeToQuit < monotonicallyIncreasingTime() || (isMainThread() && Scheduler::shared()->shouldYieldForHighPriorityWork()))
+        if (!m_firingTimers || timeToQuit < monotonicallyIncreasingTime()
+            || (isMainThread() && Platform::current()->currentThread()->scheduler()->shouldYieldForHighPriorityWork()))
             break;
     }