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

extensions/common/api/printer_provider/usb_printer_manifest_data.cc

Index: extensions/common/api/printer_provider/usb_printer_manifest_data.cc
diff --git a/extensions/common/api/printer_provider/usb_printer_manifest_data.cc b/extensions/common/api/printer_provider/usb_printer_manifest_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..61dc9e83bbead07cb385cdeaf0c91b279b754d75
--- /dev/null
+++ b/extensions/common/api/printer_provider/usb_printer_manifest_data.cc
@@ -0,0 +1,64 @@
+// 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.
+
+#include "extensions/common/api/printer_provider/usb_printer_manifest_data.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "device/usb/usb_device_filter.h"
+#include "extensions/common/api/extensions_manifest_types.h"
+#include "extensions/common/manifest_constants.h"
+
+namespace extensions {
+
+UsbPrinterManifestData::UsbPrinterManifestData() {
+}
+
+UsbPrinterManifestData::~UsbPrinterManifestData() {
+}
+
+// static
+const UsbPrinterManifestData* UsbPrinterManifestData::Get(
+    const Extension* extension) {
+  return static_cast<UsbPrinterManifestData*>(
+      extension->GetManifestData(manifest_keys::kUsbPrinters));
+}
+
+// static
+scoped_ptr<UsbPrinterManifestData> UsbPrinterManifestData::FromValue(
+    const base::Value& value,
+    base::string16* error) {
+  scoped_ptr<core_api::extensions_manifest_types::UsbPrinters> usb_printers =
+      core_api::extensions_manifest_types::UsbPrinters::FromValue(value, error);
+  if (!usb_printers) {
+    return nullptr;
+  }
+
+  scoped_ptr<UsbPrinterManifestData> result(new UsbPrinterManifestData());
+  for (const auto& input : usb_printers->filters) {
+    DCHECK(input.get());
+    device::UsbDeviceFilter output;
+    output.SetVendorId(input->vendor_id);
+    if (input->product_id && input->interface_class) {
+      *error = base::ASCIIToUTF16(
+          "Only one of productId or interfaceClass may be specified.");
+      return nullptr;
+    }
+    if (input->product_id) {
+      output.SetProductId(*input->product_id);
+    }
+    if (input->interface_class) {
+      output.SetInterfaceClass(*input->interface_class);
+      if (input->interface_subclass) {
+        output.SetInterfaceSubclass(*input->interface_subclass);
+        if (input->interface_protocol) {
+          output.SetInterfaceProtocol(*input->interface_protocol);
+        }
+      }
+    }
+    result->filters_.push_back(output);
+  }
+  return result.Pass();
+}
+
+}  // namespace extensions