Allow paint invalidation containers to cross frame boundaries. (re-land #2)

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);
-    if (m_renderer.compositingState() == NotComposited) {
-        // If we're trying to issue paint invalidations of the placeholder document layer, propagate the
-        // paint invalidation to the native view system.
-        LayoutRect absRect(r);
-        LayoutPoint delta;
-        m_renderer.layer()->convertToLayerCoords(m_renderer.layer()->root(), delta);
-        absRect.moveBy(delta);
-
-        if (absRect.isEmpty())
-            return;
-
-        RenderView* view = m_renderer.view();
-        if (view)
-            view->invalidatePaintForRectangle(absRect);
-        return;
-    }
-    // FIXME: generalize accessors to backing GraphicsLayers so that this code is squasphing-agnostic.
+    // 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())
             squashingLayer->setNeedsDisplayInRect(pixelSnappedIntRect(paintInvalidationRect));
     } else {
         m_renderer.layer()->compositedLayerMapping()->setContentsNeedDisplayInRect(r);
     }
 }
 
@@ skipping 36 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