Implement Paint Containment

third_party/WebKit/Source/core/layout/LayoutInline.cpp

Index: third_party/WebKit/Source/core/layout/LayoutInline.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutInline.cpp b/third_party/WebKit/Source/core/layout/LayoutInline.cpp
index 58f6568fd484ab97715f23e4fbfa2cdac89ef240..383d3c1ffecf6a2ad1d6b5cbdabd55681a78eca8 100644
--- a/third_party/WebKit/Source/core/layout/LayoutInline.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutInline.cpp
@@ -1137,6 +1137,12 @@ LayoutSize LayoutInline::offsetFromContainer(const LayoutObject* container, cons
     return offset;
 }
 
+PaintLayerType LayoutInline::layerTypeRequired() const
+{
+    return isInFlowPositioned() || createsGroup() || hasClipPath() || style()->shouldCompositeForCurrentAnimations()
+        ||  style()->hasCompositorProxy() || style()->containsPaint() ? NormalPaintLayer : NoPaintLayer;
+}
+
 void LayoutInline::mapLocalToContainer(const LayoutBoxModelObject* paintInvalidationContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed, const PaintInvalidationState* paintInvalidationState) const
 {
     if (paintInvalidationContainer == this)