Repaint non-stacking-context composited children when they scroll.

third_party/WebKit/Source/core/paint/PaintLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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>
@@ skipping 288 matching lines @@
     bool hasVisibleDescendant() const { ASSERT(!m_visibleDescendantStatusDirty); return m_hasVisibleDescendant; }
 
     void dirtyVisibleContentStatus();
     void potentiallyDirtyVisibleContentStatus(EVisibility);
 
     bool hasBoxDecorationsOrBackground() const;
     bool hasVisibleBoxDecorations() const;
     // True if this layer container layoutObjects that paint.
     bool hasNonEmptyChildLayoutObjects() const;
 
-    // Will ensure that hasNonCompositiedChild are up to date.
+    // Will ensure that isAllScrollingContentComposited() is up to date.
     void updateScrollingStateAfterCompositingChange();
-    bool hasVisibleNonLayerContent() const { return m_hasVisibleNonLayerContent; }
-    bool hasNonCompositedChild() const { ASSERT(isAllowedToQueryCompositingState()); return m_hasNonCompositedChild; }
+    bool isAllScrollingContentComposited() const { return m_isAllScrollingContentComposited; }
 
     // Gets the ancestor layer that serves as the containing block of this layer. This is either
     // another out of flow positioned layer, or one that contains paint.
     // If |ancestor| is specified, |*skippedAncestor| will be set to true if |ancestor| is found in
     // the ancestry chain between this layer and the containing block layer; if not found, it will
     // be set to false. Either both |ancestor| and |skippedAncestor| should be nullptr, or none of
     // them should.
     PaintLayer* containingLayerForOutOfFlowPositioned(const PaintLayer* ancestor = nullptr, bool* skippedAncestor = nullptr) const;
 
     bool isPaintInvalidationContainer() const;
@@ skipping 485 matching lines @@
     mutable unsigned m_hasSelfPaintingLayerDescendant : 1;
     mutable unsigned m_hasSelfPaintingLayerDescendantDirty : 1;
 
     const unsigned m_isRootLayer : 1;
 
     unsigned m_visibleContentStatusDirty : 1;
     unsigned m_hasVisibleContent : 1;
     unsigned m_visibleDescendantStatusDirty : 1;
     unsigned m_hasVisibleDescendant : 1;
 
-    unsigned m_hasVisibleNonLayerContent : 1;
-
 #if ENABLE(ASSERT)
     unsigned m_needsPositionUpdate : 1;
 #endif
 
     unsigned m_3DTransformedDescendantStatusDirty : 1;
     // Set on a stacking context layer that has 3D descendants anywhere
     // in a preserves3D hierarchy. Hint to do 3D-aware hit testing.
     unsigned m_has3DTransformedDescendant : 1;
 
     unsigned m_containsDirtyOverlayScrollbars : 1;
 
     unsigned m_needsAncestorDependentCompositingInputsUpdate : 1;
     unsigned m_needsDescendantDependentCompositingInputsUpdate : 1;
     unsigned m_childNeedsCompositingInputsUpdate : 1;
 
     // Used only while determining what layers should be composited. Applies to the tree of z-order lists.
     unsigned m_hasCompositingDescendant : 1;
 
-    // Applies to the real layout layer tree (i.e., the tree determined by the layer's parent and children and
-    // as opposed to the tree formed by the z-order and normal flow lists).
-    unsigned m_hasNonCompositedChild : 1;
+    // True iff we have scrollable overflow and all children of m_layoutObject are known to paint
+    // exclusively into their own composited layers.  Set by updateScrollingStateAfterCompositingChange().
+    unsigned m_isAllScrollingContentComposited : 1;
 
     // Should be for stacking contexts having unisolated blending descendants.
     unsigned m_shouldIsolateCompositedDescendants : 1;
 
     // True if this layout layer just lost its grouped mapping due to the CompositedLayerMapping being destroyed,
     // and we don't yet know to what graphics layer this Layer will be assigned.
     unsigned m_lostGroupedMapping : 1;
 
     unsigned m_needsRepaint : 1;
     unsigned m_previousPaintResult : 1; // PaintLayerPainter::PaintResult
@@ skipping 49 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::PaintLayer*);
 void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif // Layer_h