Merge 197139 "Fix the logic that limits the number of frames in ..."

Source/core/dom/NodeRareData.cpp

Index: Source/core/dom/NodeRareData.cpp
===================================================================
--- Source/core/dom/NodeRareData.cpp	(revision 198700)
+++ Source/core/dom/NodeRareData.cpp	(working copy)
@@ -73,6 +73,12 @@
         this->~NodeRareData();
 }
 
+void NodeRareData::incrementConnectedSubframeCount(unsigned amount)
+{
+    RELEASE_ASSERT_WITH_SECURITY_IMPLICATION((m_connectedFrameCount + amount) <= FrameHost::maxNumberOfFrames);
+    m_connectedFrameCount += amount;
+}
+
 // Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
 static_assert(FrameHost::maxNumberOfFrames < (1 << NodeRareData::ConnectedFrameCountBits), "Frame limit should fit in rare data count");