Add field trial testing config for DownloadResumptionWithoutStrongValidators

BUG=942770

Change-Id: I2bf15ee1bf417e99a191a82160903a041ab39620
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636402
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665996}

testing/variations/fieldtrial_testing_config.json

@@ -1874,6 +1874,24 @@
             ]
         }
     ],
+    "DownloadResumptionWithoutStrongValidators": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "params": {
+                        "download_validation_length": "1024"
+                    },
+                    "enable_features": [
+                        "AllowDownloadResumptionWithoutStrongValidators"
+                    ]
+                }
+            ]
+        }
+    ],
     "DownloadsLocationChange": [
         {
             "platforms": [