[iOS] Add fieldtrial config for GRPC

Bug: None
Change-Id: I368ba4d9285f034354190106404906ef5ee7c3cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6268489
Auto-Submit: Christian Xu <christianxu@chromium.org>
Commit-Queue: Radu Nitescu <radunitescu@google.com>
Commit-Queue: Christian Xu <christianxu@chromium.org>
Reviewed-by: Radu Nitescu <radunitescu@google.com>
Cr-Commit-Position: refs/heads/main@{#1420576}
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index 4ca18a8..04f4ec8 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -11867,6 +11867,22 @@
             ]
         }
     ],
+    "IOSGRPC": [
+        {
+            "platforms": [
+                "ios"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "LensUnaryApisWithHttpTransportEnabled",
+                        "LensUnaryHttpTransportEnabled"
+                    ]
+                }
+            ]
+        }
+    ],
     "IOSHomeCustomization": [
         {
             "platforms": [