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

extensions/common/api/printer_provider/usb_printer_manifest_data.h

Index: extensions/common/api/printer_provider/usb_printer_manifest_data.h
diff --git a/extensions/common/api/printer_provider/usb_printer_manifest_data.h b/extensions/common/api/printer_provider/usb_printer_manifest_data.h
index fae6053fc3c4573c0c53645be710f1748957a6dd..6c2eef4d5f78aa55dc831d800778937d67f1f6b1 100644
--- a/extensions/common/api/printer_provider/usb_printer_manifest_data.h
+++ b/extensions/common/api/printer_provider/usb_printer_manifest_data.h
@@ -10,6 +10,7 @@
 #include "extensions/common/extension.h"
 
 namespace device {
+class UsbDevice;
 class UsbDeviceFilter;
 }
 
@@ -30,6 +31,8 @@ class UsbPrinterManifestData : public Extension::ManifestData {
   static scoped_ptr<UsbPrinterManifestData> FromValue(const base::Value& value,
                                                       base::string16* error);
 
+  bool SupportsDevice(scoped_refptr<device::UsbDevice> device) const;

[Vitaly Buka (NO REVIEWS), 2015/05/28 22:50:55]

const scoped_refptr<device::UsbDevice>&

[Reilly Grant (use Gerrit), 2015/05/28 23:04:50]

Done.

+
   const std::vector<device::UsbDeviceFilter>& filters() const {
     return filters_;
   }