fix: silent printing default dpi on Windows (#41811)

shell/browser/printing/printing_utils.h

@@ -0,0 +1,41 @@
+// Copyright (c) 2024 Microsoft, GmbH.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ELECTRON_SHELL_BROWSER_PRINTING_PRINTING_UTILS_H_
+#define ELECTRON_SHELL_BROWSER_PRINTING_PRINTING_UTILS_H_
+
+#include <string>
+
+#include "base/memory/scoped_refptr.h"
+#include "base/task/task_runner.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace electron {
+
+// This function returns the per-platform default printer's DPI.
+gfx::Size GetDefaultPrinterDPI(const std::u16string& device_name);
+
+// This will return false if no printer with the provided device_name can be
+// found on the network. We need to check this because Chromium does not do
+// sanity checking of device_name validity and so will crash on invalid names.
+bool IsDeviceNameValid(const std::u16string& device_name);
+
+// This function returns a validated device name.
+// If the user passed one to webContents.print(), we check that it's valid and
+// return it or fail if the network doesn't recognize it. If the user didn't
+// pass a device name, we first try to return the system default printer. If one
+// isn't set, then pull all the printers and use the first one or fail if none
+// exist.
+std::pair<std::string, std::u16string> GetDeviceNameToUse(
+    const std::u16string& device_name);
+
+// This function creates a task runner for use with printing tasks.
+scoped_refptr<base::TaskRunner> CreatePrinterHandlerTaskRunner();
+
+}  // namespace electron
+
+#endif  // ELECTRON_SHELL_BROWSER_PRINTING_PRINTING_UTILS_H_