Add partial damage support to new draw path

Change-Id: I612578fd181240de71297c9a28bc9a8f350764a7
diff --git a/libs/hwui/unit_tests/TestUtils.h b/libs/hwui/unit_tests/TestUtils.h
index 257dd28..9b7d1b9 100644
--- a/libs/hwui/unit_tests/TestUtils.h
+++ b/libs/hwui/unit_tests/TestUtils.h
@@ -46,6 +46,12 @@
         return snapshot;
     }
 
+    static SkBitmap createSkBitmap(int width, int height) {
+        SkBitmap bitmap;
+        bitmap.setInfo(SkImageInfo::MakeUnknown(width, height));
+        return bitmap;
+    }
+
     template<class CanvasType>
     static std::unique_ptr<DisplayListData> createDLD(int width, int height,
             std::function<void(CanvasType& canvas)> canvasCallback) {