Add FieldTrial testing config for WebRTC-NoSdpMangleUfragRestrictedAddresses

The ports used in the parameter here are different from the ones that
are being controlled through Finch, as these might change over time.

Bug: 409713509
Change-Id: Ibf3bd24494d7547eb43bbbc88b855120ad406d20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6513064
Reviewed-by: Tomas Gunnarsson <tommi@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Auto-Submit: Tom Van Goethem <tov@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Tom Van Goethem <tov@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1456979}

testing/variations/fieldtrial_testing_config.json

@@ -25049,6 +25049,19 @@
             ]
         }
     ],
+    "WebRTC-NoSdpMangleUfragRestrictedAddresses": [
+        {
+            "platforms": [
+                "android",
+                "android_webview"
+            ],
+            "experiments": [
+                {
+                    "name": "127.0.0.1:12345|127.0.0.1:23456|127.0.0.1:34567|127.0.0.1:45678|127.0.0.1:56789"
+                }
+            ]
+        }
+    ],
     "WebRTC-SendBufferSizeBytes": [
         {
             "platforms": [