Add an API to report debugName in GraphicsLayer

Source/web/PinchViewports.cpp

Index: Source/web/PinchViewports.cpp
diff --git a/Source/web/PinchViewports.cpp b/Source/web/PinchViewports.cpp
index 4e612b0de91f269034b3a727973577cc912eb28a..c2fc7e9eb94558cecf8a4500ce25b5e18f015c9f 100644
--- a/Source/web/PinchViewports.cpp
+++ b/Source/web/PinchViewports.cpp
@@ -67,13 +67,6 @@ PinchViewports::PinchViewports(WebViewImpl* owner)
 
     m_innerViewportScrollLayer->platformLayer()->setScrollable(true);
 
-#ifndef NDEBUG
-    m_innerViewportContainerLayer->setName("inner viewport container layer");
-    m_pageScaleLayer->setName("page scale layer");
-    m_innerViewportScrollLayer->setName("inner viewport scroll layer");
-    m_overlayScrollbarHorizontal->setName("overlay scrollbar horizontal");
-    m_overlayScrollbarVertical->setName("overlay scrollbar vertical");
-#endif
 
     m_innerViewportContainerLayer->addChild(m_pageScaleLayer.get());
     m_pageScaleLayer->addChild(m_innerViewportScrollLayer.get());
@@ -186,4 +179,24 @@ void PinchViewports::paintContents(const GraphicsLayer*, WebCore::GraphicsContex
 {
 }
 
+String PinchViewports::debugName(const GraphicsLayer* graphicsLayer)
+{
+    String name;
+    if (graphicsLayer == m_innerViewportContainerLayer.get()) {
+        name = "Inner Viewport Container Layer";
+    } else if (graphicsLayer == m_pageScaleLayer.get()) {
+        name =  "Page Scale Layer";
+    } else if (graphicsLayer == m_innerViewportScrollLayer.get()) {
+        name =  "Inner Viewport Scroll Layer";
+    } else if (graphicsLayer == m_overlayScrollbarHorizontal.get()) {
+        name =  "Overlay Scrollbar Horizontal Layer";
+    } else if (graphicsLayer == m_overlayScrollbarVertical.get()) {
+        name =  "Overlay Scrollbar Vertical Layer";
+    } else {
+        ASSERT_NOT_REACHED();
+    }
+
+    return name;
+}
+
 } // namespace WebKit