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 103 matching lines @@
     if (m_renderer.layer()->groupedMapping()) {
         LayoutRect paintInvalidationRect = r;
         paintInvalidationRect.move(m_renderer.layer()->subpixelAccumulation());
         if (GraphicsLayer* squashingLayer = m_renderer.layer()->groupedMapping()->squashingLayer())
             squashingLayer->setNeedsDisplayInRect(pixelSnappedIntRect(paintInvalidationRect));
     } else {
         m_renderer.layer()->compositedLayerMapping()->setContentsNeedDisplayInRect(r);
     }
 }
 
+void RenderLayerRepainter::setBackingIncludesFirstPaintInvalidation()
+{
+    GraphicsLayer* backingLayer = m_renderer.layer()->graphicsLayerBacking();

[chrishtr, 2014/08/25 16:55:05]

Per comment in RenderObject, get rid of this method and inline into
setNeedsPaintInvaliationInRect. The backingLayer will always be present there as
well.

[kouhei (in TOK), 2014/08/26 14:18:18]

Done.

+    if (backingLayer)
+        backingLayer->setIncludesFirstPaintInvalidation();
+}
+
 void RenderLayerRepainter::setFilterBackendNeedsPaintInvalidationInRect(const LayoutRect& rect)
 {
     if (rect.isEmpty())
         return;
     LayoutRect rectForPaintInvalidation = rect;
 
     ASSERT(m_renderer.layer()->filterInfo());
 
     RenderLayer* parentLayer = enclosingFilterPaintInvalidationLayer();
     ASSERT(parentLayer);
@@ skipping 25 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