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

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 957 matching lines @@
     if (frame().page())
         frame().page()->chrome().client().layoutUpdated(m_frame.get());
 }
 
 // The plan is to move to compositor-queried paint invalidation, in which case this
 // method would setNeedsRedraw on the GraphicsLayers with invalidations and
 // let the compositor pick which to actually draw.
 // See http://crbug.com/306706
 void FrameView::invalidateTreeIfNeeded()
 {
-    RenderObject* rootForPaintInvalidation = renderView();
-    ASSERT(!rootForPaintInvalidation->needsLayout());
+    RenderView& rootForPaintInvalidation = *renderView();
+    ASSERT(!rootForPaintInvalidation.needsLayout());
 
-    TRACE_EVENT1("blink", "FrameView::invalidateTree", "root", rootForPaintInvalidation->debugName().ascii());
+    TRACE_EVENT1("blink", "FrameView::invalidateTree", "root", rootForPaintInvalidation.debugName().ascii());
 
-    PaintInvalidationState rootPaintInvalidationState(*rootForPaintInvalidation);
+    PaintInvalidationState rootPaintInvalidationState(rootForPaintInvalidation);
 
-    rootForPaintInvalidation->invalidateTreeIfNeeded(rootPaintInvalidationState);
+    rootForPaintInvalidation.invalidateTreeIfNeeded(rootPaintInvalidationState);
 
     // Invalidate the paint of the frameviews scrollbars if needed
     if (hasVerticalBarDamage())
         invalidateRect(verticalBarDamage());
     if (hasHorizontalBarDamage())
         invalidateRect(horizontalBarDamage());
     resetScrollbarDamage();
 
     m_doFullPaintInvalidation = false;
 #ifndef NDEBUG
@@ skipping 609 matching lines @@
 {
     Page* page = frame().page();
     if (!page)
         return 0;
     return &page->chrome();
 }
 
 void FrameView::contentRectangleForPaintInvalidation(const IntRect& r)
 {
     ASSERT(paintInvalidationIsAllowed());
-    ASSERT(!m_frame->owner());
+    ASSERT(!m_frame->ownerRenderer());
 
     if (m_isTrackingPaintInvalidations) {
         IntRect paintInvalidationRect = r;
         paintInvalidationRect.move(-scrollOffset());
         m_trackedPaintInvalidationRects.append(paintInvalidationRect);
         // FIXME: http://crbug.com/368518. Eventually, invalidateContentRectangleForPaint
         // is going away entirely once all layout tests are FCM. In the short
         // term, no code should be tracking non-composited FrameView paint invalidations.
         RELEASE_ASSERT_NOT_REACHED();
     }
@@ skipping 1503 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace blink