Auto-dismiss Welcome to Chrome dialog; add suppress flags for first-run popups

browser.py

@@ -505,6 +505,9 @@ def launch_chrome():
         "--disable-session-crashed-bubble",
         "--disable-save-password-bubble",
         "--disable-restore-session-state",
+        "--suppress-message-center-popups",
+        "--disable-default-browser-check",
+        "--no-first-run",
         "--disable-features=TranslateUI,OptimizationHints,OptimizationHintsFetching,OptimizationTargetPrediction,OptimizationGuideModelDownloading",
         "--disable-component-update",
         "--disable-background-networking",
@@ -536,15 +539,19 @@ if __name__ == "__main__":
 
     def dismiss_chrome_dialogs():
         """
-        Chrome sometimes shows a 'Profile error occurred' dialog on startup.
-        This runs in the background and closes it automatically so the senior
-        never sees it.  We try a few times over 10 seconds to catch it.
+        Chrome shows startup dialogs (first-run welcome, profile errors) on a
+        fresh or corrupted profile.  Dismiss them all automatically so the
+        senior never sees them.  Runs for ~15 seconds after startup.
         """
-        for _ in range(10):
+        dialogs = [
+            "Welcome to Google Chrome",
+            "Profile error occurred",
+        ]
+        for _ in range(15):
             time.sleep(1)
+            for title in dialogs:
                 subprocess.run(
-                ["xdotool", "search", "--name", "Profile error occurred",
-                 "key", "Return"],
+                    ["xdotool", "search", "--name", title, "key", "Return"],
                     stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL
                 )