Add SaveEditedPDFForm experiment to field trial testing config.

Bug: 61248,1094093
Change-Id: Id4afed57913d957a5f79e05c1720739d4cbccc32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316442Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791354}

testing/variations/fieldtrial_testing_config.json

@@ -6370,6 +6370,23 @@
             ]
         }
     ],
+    "SaveEditedPDFForm": [
+        {
+            "platforms": [
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SaveEditedPDFForm"
+                    ]
+                }
+            ]
+        }
+    ],
     "ScrollResamplingRollout": [
         {
             "platforms": [