Oilpan: Give a chance to schedule a precise GC after V8 minor and major GCs

Source/platform/heap/ThreadState.h

Index: Source/platform/heap/ThreadState.h
diff --git a/Source/platform/heap/ThreadState.h b/Source/platform/heap/ThreadState.h
index b3dbaacae787327e052f45f805d51b1110cdc839..497fc612e3a7b72eabf8d8415973c8047392dbda 100644
--- a/Source/platform/heap/ThreadState.h
+++ b/Source/platform/heap/ThreadState.h
@@ -328,6 +328,7 @@ public:
     void scheduleIdleGC();
     void scheduleIdleLazySweep();
     void schedulePreciseGC();
+    void scheduleV8FollowupGCIfNeeded();
     void schedulePageNavigationGCIfNeeded(float estimatedRemovalRatio);
     void schedulePageNavigationGC();
     void scheduleGCIfNeeded();
@@ -689,6 +690,11 @@ private:
     bool shouldScheduleIdleGC();
     bool shouldSchedulePreciseGC();
     bool shouldForceConservativeGC();
+    // V8 minor or major GC is likely to drop a lot of references to objects
+    // on Oilpan's heap. We give a chance to schedule a GC.
+    bool shouldScheduleV8FollowupGC();
+    // Page navigation is likely to drop a lot of references to objects
+    // on Oilpan's heap. We give a chance to schedule a GC.
     // estimatedRemovalRatio is the estimated ratio of objects that will be no
     // longer necessary due to the navigation.
     bool shouldSchedulePageNavigationGC(float estimatedRemovalRatio);