Alternate way to track first paint

Source/core/rendering/RenderView.cpp

Index: Source/core/rendering/RenderView.cpp
diff --git a/Source/core/rendering/RenderView.cpp b/Source/core/rendering/RenderView.cpp
index 78a7aeba62d70a66764d094a08df83377b3393e9..ad993728694e6e25a410c78de9970fb6a699bceb 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -337,7 +337,7 @@ void RenderView::invalidateTreeIfNeeded(const PaintInvalidationState& paintInval
     RenderBlock::invalidateTreeIfNeeded(paintInvalidationState);
 }
 
-void RenderView::invalidatePaintForRectangle(const LayoutRect& paintInvalidationRect) const
+void RenderView::invalidatePaintForRectangle(const LayoutRect& paintInvalidationRect, InvalidationReason invalidationReason) const
 {
     ASSERT(!paintInvalidationRect.isEmpty());
 
@@ -347,7 +347,7 @@ void RenderView::invalidatePaintForRectangle(const LayoutRect& paintInvalidation
     ASSERT(layer()->compositingState() == PaintsIntoOwnBacking || !frame()->ownerRenderer());
 
     if (layer()->compositingState() == PaintsIntoOwnBacking) {
-        setBackingNeedsPaintInvalidationInRect(paintInvalidationRect);
+        setBackingNeedsPaintInvalidationInRect(paintInvalidationRect, invalidationReason);
     } else {
         m_frameView->contentRectangleForPaintInvalidation(pixelSnappedIntRect(paintInvalidationRect));
     }