Fix invalidity in HitTestCache with LayoutParts.

Source/core/layout/LayoutView.cpp

Index: Source/core/layout/LayoutView.cpp
diff --git a/Source/core/layout/LayoutView.cpp b/Source/core/layout/LayoutView.cpp
index 0993de0c8751285c5da080fc3d99d81b27a66e1c..72da1bc1a320550cbf9401be221cc8dd4a2d5d42 100644
--- a/Source/core/layout/LayoutView.cpp
+++ b/Source/core/layout/LayoutView.cpp
@@ -124,6 +124,13 @@ bool LayoutView::hitTestNoLifecycleUpdate(HitTestResult& result)
     return hitLayer;
 }
 
+void LayoutView::clearHitTestCache()
+{
+    m_hitTestCache->clear();
+    if (LayoutPart* frameLayoutObject = frame()->ownerLayoutObject())
+        frameLayoutObject->view()->clearHitTestCache();
+}
+
 void LayoutView::computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit, LogicalExtentComputedValues& computedValues) const
 {
     computedValues.m_extent = (!shouldUsePrintingLayout() && m_frameView) ? LayoutUnit(viewLogicalHeightForBoxSizing()) : logicalHeight;