Improve performance when calling PaintLayer::setNeedsRepaint()

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

Index: third_party/WebKit/Source/core/layout/PaintInvalidationState.cpp
diff --git a/third_party/WebKit/Source/core/layout/PaintInvalidationState.cpp b/third_party/WebKit/Source/core/layout/PaintInvalidationState.cpp
index 86d5be22199f4895838dfab82c3ffd4eef60d642..58a7a965eda3ab698a1b163c88c82b0d65a34e75 100644
--- a/third_party/WebKit/Source/core/layout/PaintInvalidationState.cpp
+++ b/third_party/WebKit/Source/core/layout/PaintInvalidationState.cpp
@@ -20,6 +20,7 @@ PaintInvalidationState::PaintInvalidationState(const LayoutView& layoutView, Vec
     , m_viewClippingAndScrollOffsetDisabled(false)
     , m_paintInvalidationContainer(layoutView.containerForPaintInvalidation())
     , m_pendingDelayedPaintInvalidations(pendingDelayedPaintInvalidations)
+    , m_enclosingLayer(*layoutView.layer())
 {
     bool establishesPaintInvalidationContainer = layoutView == m_paintInvalidationContainer;
     if (!establishesPaintInvalidationContainer) {
@@ -46,6 +47,7 @@ PaintInvalidationState::PaintInvalidationState(PaintInvalidationState& next, Lay
     , m_viewClippingAndScrollOffsetDisabled(false)
     , m_paintInvalidationContainer(paintInvalidationContainer)
     , m_pendingDelayedPaintInvalidations(next.pendingDelayedPaintInvalidationTargets())
+    , m_enclosingLayer(layoutObject.hasLayer() ? *layoutObject.layer() : next.enclosingLayer())
 {
     // FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054
     bool establishesPaintInvalidationContainer = layoutObject == m_paintInvalidationContainer;
@@ -107,6 +109,7 @@ PaintInvalidationState::PaintInvalidationState(PaintInvalidationState& next, con
     , m_paintOffset(next.m_paintOffset)
     , m_paintInvalidationContainer(next.m_paintInvalidationContainer)
     , m_pendingDelayedPaintInvalidations(next.pendingDelayedPaintInvalidationTargets())
+    , m_enclosingLayer(next.enclosingLayer())
 {
     ASSERT(layoutObject != m_paintInvalidationContainer);