[Impeller] implement external texture gl for embedder. (#56277)

Fixes https://github.com/flutter/flutter/issues/143809
https://dart.googlesource.com/external/github.com/flutter/engine/+/75f4b80aff4c9b2dc71f1dee7acce13d6b104f65
diff --git a/DEPS b/DEPS
index 1a61a2b..ac0d509 100644
--- a/DEPS
+++ b/DEPS
@@ -267,7 +267,7 @@
 deps = {
   'engine/src': 'https://github.com/flutter/buildroot.git' + '@' + 'cc9bcddf1524812c80ef741191d5db7469e705de',
 
-  'engine/src/flutter': Var('flutter_git') + '/mirrors/engine' + '@' + 'c55042c3f2698a0718fc80bbdcba68c10331366c',
+  'engine/src/flutter': Var('flutter_git') + '/mirrors/engine' + '@' + '75f4b80aff4c9b2dc71f1dee7acce13d6b104f65',
 
   'engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '1a0273672a5645ae73aaa8707aa33c4e64160c65',
 
diff --git a/commits.json b/commits.json
index 07f1cc9..ca18d41 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "engine/src/flutter":"c55042c3f2698a0718fc80bbdcba68c10331366c",
+  "engine/src/flutter":"75f4b80aff4c9b2dc71f1dee7acce13d6b104f65",
   "engine/src/flutter/third_party/dart":"1a0273672a5645ae73aaa8707aa33c4e64160c65",
   "flutter":"9a5e8ce6b52c8e8a8864270c45ea6a82497e7bb2"
 }
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