Statistics of LayoutBox rare data reasons

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
index a67d5daa6b6ed92a786f29761a9469fa43a62f88..c725f1fed3ed2bad7be9e111b361b1d87839d33a 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
@@ -3456,15 +3456,15 @@ String CompositedLayerMapping::debugName(
     const GraphicsLayer* graphicsLayer) const {
   String name;
   if (graphicsLayer == m_graphicsLayer.get()) {
-    name = m_owningLayer.debugName();
+    name = "Main Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_squashingContainmentLayer.get()) {
-    name = "Squashing Containment Layer";
+    name = "Squashing Containment Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_squashingLayer.get()) {
     name = "Squashing Layer (first squashed layer: " +
            (m_squashedLayers.size() > 0
                 ? m_squashedLayers[0].paintLayer->debugName()
                 : "") +
-           ")";
+           ") " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_ancestorClippingLayer.get()) {
     name = "Ancestor Clipping Layer";
   } else if (graphicsLayer == m_ancestorClippingMaskLayer.get()) {
@@ -3474,25 +3474,26 @@ String CompositedLayerMapping::debugName(
   } else if (graphicsLayer == m_backgroundLayer.get()) {
     name = m_owningLayer.debugName() + " (background) Layer";
   } else if (graphicsLayer == m_childContainmentLayer.get()) {
-    name = "Child Containment Layer";
+    name = "Child Containment Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_childTransformLayer.get()) {
-    name = "Child Transform Layer";
+    name = "Child Transform Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_maskLayer.get()) {
-    name = "Mask Layer";
+    name = "Mask Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_childClippingMaskLayer.get()) {
-    name = "Child Clipping Mask Layer";
+    name = "Child Clipping Mask Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_layerForHorizontalScrollbar.get()) {
-    name = "Horizontal Scrollbar Layer";
+    name = "Horizontal Scrollbar Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_layerForVerticalScrollbar.get()) {
-    name = "Vertical Scrollbar Layer";
+    name = "Vertical Scrollbar Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_layerForScrollCorner.get()) {
-    name = "Scroll Corner Layer";
+    name = "Scroll Corner Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_overflowControlsHostLayer.get()) {
-    name = "Overflow Controls Host Layer";
+    name = "Overflow Controls Host Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_overflowControlsAncestorClippingLayer.get()) {
-    name = "Overflow Controls Ancestor Clipping Layer";
+    name = "Overflow Controls Ancestor Clipping Layer " +
+           m_owningLayer.debugName();
   } else if (graphicsLayer == m_scrollingLayer.get()) {
-    name = "Scrolling Layer";
+    name = "Scrolling Layer " + m_owningLayer.debugName();
   } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
     name = "Scrolling Contents Layer";
   } else if (graphicsLayer == m_decorationOutlineLayer.get()) {