Fix and adjust PageNavigationGC threshold

third_party/WebKit/Source/platform/heap/ThreadState.cpp

Index: third_party/WebKit/Source/platform/heap/ThreadState.cpp
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.cpp b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
index 1e039b9e5512788296556f1773f4aee046d0a7e5..a481281eb01d2e06a6cb2e7caa3291db9ae7665f 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.cpp
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
@@ -575,7 +575,10 @@ bool ThreadState::shouldScheduleV8FollowupGC()
 
 bool ThreadState::shouldSchedulePageNavigationGC(float estimatedRemovalRatio)
 {
-    return judgeGCThreshold(1024 * 1024, 1.5 * (1 - estimatedRemovalRatio));
+    // If estimatedRemovalRatio is low we should let IdleGC handle this.
+    if (estimatedRemovalRatio < 0.01)
+        return false;
+    return judgeGCThreshold(32 * 1024 * 1024, 1.5 * (1 - estimatedRemovalRatio));
 }
 
 bool ThreadState::shouldForceConservativeGC()
@@ -672,7 +675,6 @@ void ThreadState::schedulePageNavigationGCIfNeeded(float estimatedRemovalRatio)
         dataLogF("Scheduled PageNavigationGC\n");
 #endif
         schedulePageNavigationGC();
-        return;
     }
 }