Add a manifest property declaring USB printers supported by an app.

extensions/common/api/printer_provider/usb_printer_manifest_data.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_COMMON_API_PRINTER_PROVIDER_USB_PRINTER_MANIFEST_DATA_H_
+#define EXTENSIONS_COMMON_API_PRINTER_PROVIDER_USB_PRINTER_MANIFEST_DATA_H_
+
+#include <vector>
+
+#include "extensions/common/extension.h"
+
+namespace device {
+class UsbDeviceFilter;
+}
+
+namespace extensions {
+
+// The parsed form of the "usb_printers" manifest entry.
+class UsbPrinterManifestData : public Extension::ManifestData {
+ public:
+  UsbPrinterManifestData();
+  ~UsbPrinterManifestData() override;
+
+  // Gets the UsbPrinterManifestData for |extension|, or NULL if none was
+  // specified.
+  static const UsbPrinterManifestData* Get(const Extension* extension);
+
+  // Parses the data stored in |value|. Sets |error| and returns an empty
+  // scoped_ptr on failure.
+  static scoped_ptr<UsbPrinterManifestData> FromValue(const base::Value& value,
+                                                      base::string16* error);
+
+  const std::vector<device::UsbDeviceFilter>& filters() const {
+    return filters_;
+  }
+
+ private:
+  std::vector<device::UsbDeviceFilter> filters_;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_API_PRINTER_PROVIDER_USB_PRINTER_MANIFEST_DATA_H_