workloads/speedometer: Dismiss notification pop-up

When speedometer is running on a Chrome package on Android 14, a pop-up
window was showing on the screen. Chrome preferences file is modified
to dismiss the window.

wa/workloads/speedometer/__init__.py

@@ -204,6 +204,7 @@ def setup(self, context):
                 '<boolean name="first_run_tos_accepted" value="true" />\n',
                 '<boolean name="first_run_signin_complete" value="true" />\n',
                 '<boolean name="displayed_data_reduction_promo" value="true" />\n',
+                '<int name="Chrome.NotificationPermission.RequestCount" value="2" />\n',
             ]:
                 lines.insert(len(lines) - 1, line)