fix(extensions): enable WebSQL in background pages (#24798)

* fix(extensions): enable WebSQL in background pages

* fix: apply suggestions

* fix: remove duplicate include

* fix: remove trailing spaces

shell/browser/electron_browser_client.cc

@@ -772,6 +772,16 @@ void ElectronBrowserClient::AppendExtraCommandLineSwitches(
       command_line->AppendSwitch("profile-electron-init");
     }
 
+    // Extension background pages don't have WebContentsPreferences, but they
+    // support WebSQL by default.
+#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
+    content::RenderProcessHost* process =
+        content::RenderProcessHost::FromID(process_id);
+    if (extensions::ProcessMap::Get(process->GetBrowserContext())
+            ->Contains(process_id))
+      command_line->AppendSwitch(switches::kEnableWebSQL);
+#endif
+
     content::WebContents* web_contents =
         GetWebContentsFromProcessID(process_id);
     if (web_contents) {