Add GraphicsLayerDebugInfo::includesNewPaintInvalidation to distinguish paint from new RenderObjects

Source/core/rendering/RenderLayerRepainter.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 92 matching lines @@
         paintInvalidationRect.unite(child->paintInvalidator().paintInvalidationRectIncludingNonCompositingDescendants());
     }
     return paintInvalidationRect;
 }
 
 void RenderLayerRepainter::setBackingNeedsPaintInvalidationInRect(const LayoutRect& r)
 {
     // https://bugs.webkit.org/show_bug.cgi?id=61159 describes an unreproducible crash here,
     // so assert but check that the layer is composited.
     ASSERT(m_renderer.compositingState() != NotComposited);
+
+    bool firstPaint = !m_renderer.hadPaintInvalidation();
+    m_renderer.setHadPaintInvalidation();
+
     // FIXME: generalize accessors to backing GraphicsLayers so that this code is squashing-agnostic.
     if (m_renderer.layer()->groupedMapping()) {
         LayoutRect paintInvalidationRect = r;
         paintInvalidationRect.move(m_renderer.layer()->subpixelAccumulation());
-        if (GraphicsLayer* squashingLayer = m_renderer.layer()->groupedMapping()->squashingLayer())
+        if (GraphicsLayer* squashingLayer = m_renderer.layer()->groupedMapping()->squashingLayer()) {
             squashingLayer->setNeedsDisplayInRect(pixelSnappedIntRect(paintInvalidationRect));
+            if (firstPaint)
+                squashingLayer->setIncludesFirstPaintInvalidation();
+        }
     } else {
-        m_renderer.layer()->compositedLayerMapping()->setContentsNeedDisplayInRect(r);
+        CompositedLayerMapping* mapping = m_renderer.layer()->compositedLayerMapping();
+        ASSERT(mapping);
+        mapping->setContentsNeedDisplayInRect(r);
+        if (firstPaint)
+            mapping->mainGraphicsLayer()->setIncludesFirstPaintInvalidation();
     }
 }
 
 void RenderLayerRepainter::setFilterBackendNeedsPaintInvalidationInRect(const LayoutRect& rect)
 {
     if (rect.isEmpty())
         return;
     LayoutRect rectForPaintInvalidation = rect;
 
     ASSERT(m_renderer.layer()->filterInfo());
@@ skipping 28 matching lines @@
 RenderLayer* RenderLayerRepainter::enclosingFilterPaintInvalidationLayer() const
 {
     for (const RenderLayer* curr = m_renderer.layer(); curr; curr = curr->parent()) {
         if ((curr != m_renderer.layer() && curr->requiresFullLayerImageForFilters()) || curr->compositingState() == PaintsIntoOwnBacking || curr->isRootLayer())
             return const_cast<RenderLayer*>(curr);
     }
     return 0;
 }
 
 } // namespace blink