[fuchsia] Avoid unnecessary layout transition. (#18653)

See https://github.com/KhronosGroup/Vulkan-Samples/blob/master/samples/performance/layout_transitions/layout_transitions_tutorial.md#transaction-elimination-on-mali-gpus
for an explanation of why transitioning the layout hurts performance
on Mali drivers.

Co-authored-by: David Reveman <reveman@google.com>
https://dart.googlesource.com/external/github.com/flutter/engine/+/c19459ab7d3f30c87a403aee6aadb483968c82ec
diff --git a/commits.json b/commits.json
index 13acf89..8ba6a75 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"efe3f4569a6aa49935ffb9a688812f46a2971b89",
+  "external/github.com/flutter/engine":"c19459ab7d3f30c87a403aee6aadb483968c82ec",
   "external/github.com/flutter/flutter":"a1636b6fef2ebe7840ba6dc1b3f9d77095ef3b45",
   "sdk":"d6ec2530fd6015226a7957dda7499c2be156b174"
 }
\ No newline at end of file