Oilpan: An Oilpan idle GC should follow a V8 major GC

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 84eb6517c6a57599e68c328f74e55aaf74f3636d..c2ce561e339879cfa0e779c237e861baf9262da1 100644
--- a/Source/platform/heap/ThreadState.cpp
+++ b/Source/platform/heap/ThreadState.cpp
@@ -670,7 +670,7 @@ bool ThreadState::shouldForceConservativeGC()
     return judgeGCThreshold(32 * 1024 * 1024, 5.0);
 }
 
-void ThreadState::scheduleV8FollowupGCIfNeeded()
+void ThreadState::scheduleV8FollowupGCIfNeeded(bool shouldScheduleIdleGC)
 {
     ASSERT(checkThread());
     Heap::reportMemoryUsageForTracing();
@@ -684,6 +684,8 @@ void ThreadState::scheduleV8FollowupGCIfNeeded()
 
     if (shouldScheduleV8FollowupGC())
         schedulePreciseGC();
+    else if (shouldScheduleIdleGC)
+        scheduleIdleGC();
 }
 
 void ThreadState::schedulePageNavigationGCIfNeeded(float estimatedRemovalRatio)