Enable an image in the save password bubble on the waterfall for testing.

Bug: 1015447
Change-Id: I252d93ab9269b83402300d9835797d5399a40a19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868995Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707359}

testing/variations/fieldtrial_testing_config.json

@@ -5353,6 +5353,27 @@
             ]
         }
     ],
+    "SavePasswordIllustration": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "params": {
+                        "image": "1"
+                    },
+                    "enable_features": [
+                        "SavePasswordIllustration"
+                    ]
+                }
+            ]
+        }
+    ],
     "SchedulerConfiguration": [
         {
             "platforms": [