Add initial benchmarks for CanvasOp

Also some minor other tweaks

Test: this
Change-Id: Idb8a5955839893ff000de87d4899fd130ede061c
diff --git a/libs/hwui/DisplayList.h b/libs/hwui/DisplayList.h
index dc63e5d..dd24763 100644
--- a/libs/hwui/DisplayList.h
+++ b/libs/hwui/DisplayList.h
@@ -16,14 +16,15 @@
 
 #pragma once
 
-#include "pipeline/skia/SkiaDisplayList.h"
-
 namespace android {
 namespace uirenderer {
 
 namespace VectorDrawable {
 class Tree;
 };
+namespace skiapipeline {
+class SkiaDisplayList;
+}
 typedef uirenderer::VectorDrawable::Tree VectorDrawableRoot;
 
 /**