Oilpan: Schedule a precise GC when a page navigates

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index f7cd33e9b9619657a9c69428bcb4a76b93a17300..574f3fcb380a9bf6e3fb7c851a73c1cdf88f9e67 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -1037,6 +1037,13 @@ public:
 
     CanvasFontCache* canvasFontCache();
 
+    void incrementNodeCount() { m_nodeCount++; }
+    void decrementNodeCount() { m_nodeCount--; }

[haraken, 2015/08/03 01:03:59]

I'd use 'signed int' for m_nodeCount and add ASSERT(m_nodeCount > 0) here.

[keishi, 2015/08/06 06:59:14]

Done.

+    unsigned nodeCount() { return m_nodeCount; }
+
+    using WeakDocumentSet = WillBeHeapHashSet<RawPtrWillBeWeakMember<Document>>;
+    static WeakDocumentSet& liveDocumentSet();
+
 protected:
     Document(const DocumentInit&, DocumentClassFlags = DefaultDocumentClass);
 
@@ -1383,6 +1390,8 @@ private:
     ClientHintsPreferences m_clientHintsPreferences;
 
     PersistentWillBeMember<CanvasFontCache> m_canvasFontCache;
+
+    unsigned m_nodeCount;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT WillBeHeapSupplement<Document>;