[Payment Request][Finch] Add field trial config for SkipToGPayIfNoCard.

Bug: 996468
Change-Id: I6027b0693d1ab516a7c3a9b94df82d8ca3c4ef49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035303
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738329}

testing/variations/fieldtrial_testing_config.json

@@ -4702,6 +4702,21 @@
             ]
         }
     ],
+    "PaymentRequestSkipToGPayIfNoCard": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "PaymentRequestSkipToGPayIfNoCard"
+                    ]
+                }
+            ]
+        }
+    ],
     "PdfIsolation": [
         {
             "platforms": [