Include debug name in GraphicsLayerDebugInfo.

Source/platform/graphics/GraphicsLayerDebugInfo.cpp

Index: Source/platform/graphics/GraphicsLayerDebugInfo.cpp
diff --git a/Source/platform/graphics/GraphicsLayerDebugInfo.cpp b/Source/platform/graphics/GraphicsLayerDebugInfo.cpp
index cb92348ddfe525d8df65dd63524788feace8b7a3..4dcf64afd2c9c0111897171da44b41d334632e05 100644
--- a/Source/platform/graphics/GraphicsLayerDebugInfo.cpp
+++ b/Source/platform/graphics/GraphicsLayerDebugInfo.cpp
@@ -37,6 +37,7 @@ void GraphicsLayerDebugInfo::appendAsTraceFormat(blink::WebString* out) const
     RefPtr<JSONObject> jsonObject = JSONObject::create();
     appendLayoutRects(jsonObject.get());
     appendCompositingReasons(jsonObject.get());
+    appendDebugName(jsonObject.get());
     *out = jsonObject->toJSONString();
 }
 
@@ -180,4 +181,12 @@ void GraphicsLayerDebugInfo::appendCompositingReasons(JSONObject* jsonObject) co
     jsonObject->setArray("compositing_reasons", jsonArray);
 }
 
+void GraphicsLayerDebugInfo::appendDebugName(JSONObject* jsonObject) const
+{
+    if (m_debugName.isEmpty())
+        return;
+
+    jsonObject->setString("layer_name", m_debugName);
+}
+
 } // namespace WebCore