Revert "Refactor setting an SkPaint onto a hwui Layer."

This reverts commit e889298cd6ae1fc0d76bc00d7d12586db03eb261.

Change-Id: I4b1d609b2d4280595d40cb10d6c18875c22999f8
diff --git a/libs/hwui/Layer.h b/libs/hwui/Layer.h
index 8cc027a..ec80e9c 100644
--- a/libs/hwui/Layer.h
+++ b/libs/hwui/Layer.h
@@ -117,7 +117,7 @@
         texture.height = height;
     }
 
-    ANDROID_API void setPaint(const SkPaint* paint);
+    ANDROID_API void setPaint(SkPaint* paint);
 
     inline void setBlend(bool blend) {
         texture.blend = blend;