Add DisableForceDeferInChildFrames to field trial config

Bug: 1050803
Change-Id: I1fa5080a5a6f7bf14ceae537df8f55009d7d2aee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2405562
Auto-Submit: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806045}

testing/variations/fieldtrial_testing_config.json

@@ -2224,6 +2224,21 @@
             ]
         }
     ],
+    "DisableForceDeferInChildFrames": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "DisableForceDeferInChildFrames"
+                    ]
+                }
+            ]
+        }
+    ],
     "DisableGles2ForOopR": [
         {
             "platforms": [