Invalidate paint when allocating a DeprecatedPaintLayer.

Source/core/layout/LayoutBoxModelObject.cpp

Index: Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/Source/core/layout/LayoutBoxModelObject.cpp b/Source/core/layout/LayoutBoxModelObject.cpp
index 8595619d09ae7b2001bc6f3568787551c5f98e58..565f0c662b65ecbb752446313a0509fcb721ef88 100644
--- a/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/Source/core/layout/LayoutBoxModelObject.cpp
@@ -284,6 +284,13 @@ void LayoutBoxModelObject::styleDidChange(StyleDifference diff, const ComputedSt
 
 void LayoutBoxModelObject::createLayer(DeprecatedPaintLayerType type)
 {
+    DisablePaintInvalidationStateAsserts invalidationDisabler;
+    DisableCompositingQueryAsserts compositingDisabler;
+
+    // Acquiring a DeprecatedPaintLayer may change the paint invalidation container. Therefore we must eagerly
+    // invalidate paint for this object before creating the layer.
+    if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled() && isRooted())

[pdr., 2015/09/14 23:29:26]

Can you put the disablers in this block?

+        invalidatePaintIncludingNonCompositingDescendants();
     ASSERT(!m_layer);
     m_layer = adoptPtr(new DeprecatedPaintLayer(this, type));
     setHasLayer(true);