Temporarily enable HWUI opengl validation

Bug: 38416992
Test: device boots

Change-Id: I20b7e3546f29c0a0d3e41a7cdafbcc5f4ad387e2
diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 07ff27d..5ef2a5b 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -9,7 +9,7 @@
         // Enables fine-grained GLES error checking
         // If enabled, every GLES call is wrapped & error checked
         // Has moderate overhead
-        //"hwui_enable_opengl-validation",
+        "hwui_enable_opengl-validation",
     ],
 
     cflags: [