[PasswordManager] Added StickyBubbleExperiment

Change-Id: I7225bb27624db7abe7c95a13df9b79830c81ef9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035954
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Auto-Submit: Matthias Körber <koerber@google.com>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739100}

testing/variations/fieldtrial_testing_config.json

@@ -4626,6 +4626,24 @@
             ]
         }
     ],
+    "PasswordManagerStickyBubble": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "PasswordManagerStickyBubble"
+                    ]
+                }
+            ]
+        }
+    ],
     "PasswordProtectionForEnterprise": [
         {
             "platforms": [