Patch 2/3 to get WebScheduler via WebThread

Source/platform/heap/ThreadState.cpp

Index: Source/platform/heap/ThreadState.cpp
diff --git a/Source/platform/heap/ThreadState.cpp b/Source/platform/heap/ThreadState.cpp
index 4fc1e4fe9c25d3496400c0fa4a0b497278b20556..a5486f9c6995e9a36d85daa1995c364ea1dc5755 100644
--- a/Source/platform/heap/ThreadState.cpp
+++ b/Source/platform/heap/ThreadState.cpp
@@ -38,8 +38,8 @@
 #include "platform/heap/Handle.h"
 #include "platform/heap/Heap.h"
 #include "platform/heap/SafePoint.h"
-#include "platform/scheduler/Scheduler.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebScheduler.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/ThreadingPrimitives.h"
@@ -601,7 +601,7 @@ void ThreadState::performIdleGC(double deadlineSeconds)
         return;
 
     double idleDeltaInSeconds = deadlineSeconds - Platform::current()->monotonicallyIncreasingTime();
-    if (idleDeltaInSeconds <= Heap::estimatedMarkingTime() && !Scheduler::shared()->canExceedIdleDeadlineIfRequired()) {
+    if (idleDeltaInSeconds <= Heap::estimatedMarkingTime() && !Platform::current()->currentThread()->scheduler()->canExceedIdleDeadlineIfRequired()) {
         // If marking is estimated to take longer than the deadline and we can't
         // exceed the deadline, then reschedule for the next idle period.
         scheduleIdleGC();
@@ -664,7 +664,7 @@ void ThreadState::scheduleIdleGC()
         return;
     }
 
-    Scheduler::shared()->postNonNestableIdleTask(FROM_HERE, WTF::bind<double>(&ThreadState::performIdleGC, this));
+    Platform::current()->currentThread()->scheduler()->postNonNestableIdleTask(FROM_HERE, WTF::bind<double>(&ThreadState::performIdleGC, this));
     setGCState(IdleGCScheduled);
 }