Fix flickering when layers resize in-place

bug:27248275
Change-Id: Ia11c93ebc1097f3735071204b6f14ca079bb9fc4
diff --git a/libs/hwui/LayerBuilder.cpp b/libs/hwui/LayerBuilder.cpp
index c5af279..e6a95ff 100644
--- a/libs/hwui/LayerBuilder.cpp
+++ b/libs/hwui/LayerBuilder.cpp
@@ -349,8 +349,9 @@
 }
 
 void LayerBuilder::dump() const {
-    ALOGD("LayerBuilder %p, %ux%u buffer %p, blo %p, rn %p",
-            this, width, height, offscreenBuffer, beginLayerOp, renderNode);
+    ALOGD("LayerBuilder %p, %ux%u buffer %p, blo %p, rn %p (%s)",
+            this, width, height, offscreenBuffer, beginLayerOp,
+            renderNode, renderNode ? renderNode->getName() : "-");
     for (const BatchBase* batch : mBatches) {
         batch->dump();
     }