Include what you use

utils/PaintUtils.h was relying on a transitive include which was
changed to a forward declaration; this change adds the SkDrawLooper
include where we need it.

R=djsollen@google.com

Change-Id: I6b034c47ddc277224c7deb007c9934004c037b8c
diff --git a/libs/hwui/utils/PaintUtils.h b/libs/hwui/utils/PaintUtils.h
index ba02f5f..90248ab 100644
--- a/libs/hwui/utils/PaintUtils.h
+++ b/libs/hwui/utils/PaintUtils.h
@@ -17,6 +17,7 @@
 #define PAINT_UTILS_H
 
 #include <SkColorFilter.h>
+#include <SkDrawLooper.h>
 #include <SkXfermode.h>
 
 namespace android {