[not for review] Add Draw entries to window Performance Timeline

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 2beeea11ee7261838a72bb2cf995f77944d25141..035817f404140ec0a98d3f76cc6988a36a6a0287 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -442,6 +442,29 @@ void RenderView::invalidateTreeIfNeeded(const PaintInvalidationState& paintInval
     RenderBlock::invalidateTreeIfNeeded(paintInvalidationState);
 }
 
+LayoutRect RenderView::rectForPaintInvalidation(const LayoutRect* paintInvalidationRectPtr) const
+{
+    LayoutRect paintInvalidationRect =
+        paintInvalidationRectPtr ? *paintInvalidationRectPtr : viewRect();
+    Element* owner = document().ownerElement();
+    if (document().printing() || !m_frameView
+        || layer()->compositingState() == PaintsIntoOwnBacking || !owner)
+        return paintInvalidationRect;
+    if (RenderBox* obj = owner->renderBox()) {
+        // Intersect the viewport with the paint invalidation rect.
+        LayoutRect viewRectangle = viewRect();
+        LayoutRect rectToInvalidate = intersection(paintInvalidationRect, viewRectangle);
+
+        // Adjust for scroll offset of the view.
+        rectToInvalidate.moveBy(-viewRectangle.location());
+
+        // Adjust for frame border.
+        rectToInvalidate.moveBy(obj->contentBoxRect().location());
+        return rectToInvalidate;
+    }
+    return paintInvalidationRect;
+}
+
 void RenderView::invalidatePaintForRectangle(const LayoutRect& paintInvalidationRect) const
 {
     ASSERT(!paintInvalidationRect.isEmpty());