Add field trial test to protect saved passwords.

Bug: 1010764
Change-Id: I8ab0a2f7fe028a68698be93741e20779c4209f74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1902230Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Bettina Dea <bdea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714082}

testing/variations/fieldtrial_testing_config.json

@@ -5295,6 +5295,24 @@
             ]
         }
     ],
+    "SafeBrowsingPasswordProtectionForSavedPasswords": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SafeBrowsingPasswordProtectionForSavedPasswords"
+                    ]
+                }
+            ]
+        }
+    ],
     "SafeBrowsingPasswordProtectionForSignedInUsers": [
         {
             "platforms": [