Include USB printers in printer list as "provisional" devices.

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
index 61dc9e83bbead07cb385cdeaf0c91b279b754d75..207894fda74175d70778a98bc89f30c19b89850f 100644
--- a/extensions/common/api/printer_provider/usb_printer_manifest_data.cc
+++ b/extensions/common/api/printer_provider/usb_printer_manifest_data.cc
@@ -5,10 +5,13 @@
 #include "extensions/common/api/printer_provider/usb_printer_manifest_data.h"
 
 #include "base/strings/utf_string_conversions.h"
+#include "device/usb/usb_device.h"
 #include "device/usb/usb_device_filter.h"
 #include "extensions/common/api/extensions_manifest_types.h"
 #include "extensions/common/manifest_constants.h"
 
+using device::UsbDeviceFilter;
+
 namespace extensions {
 
 UsbPrinterManifestData::UsbPrinterManifestData() {
@@ -37,7 +40,7 @@ scoped_ptr<UsbPrinterManifestData> UsbPrinterManifestData::FromValue(
   scoped_ptr<UsbPrinterManifestData> result(new UsbPrinterManifestData());
   for (const auto& input : usb_printers->filters) {
     DCHECK(input.get());
-    device::UsbDeviceFilter output;
+    UsbDeviceFilter output;
     output.SetVendorId(input->vendor_id);
     if (input->product_id && input->interface_class) {
       *error = base::ASCIIToUTF16(
@@ -61,4 +64,9 @@ scoped_ptr<UsbPrinterManifestData> UsbPrinterManifestData::FromValue(
   return result.Pass();
 }
 
+bool UsbPrinterManifestData::SupportsDevice(
+    scoped_refptr<device::UsbDevice> device) const {
+  return UsbDeviceFilter::MatchesAny(device, filters_);
+}
+
 }  // namespace extensions