Try to read BOS and WebUSB descriptors from USB devices.

device/usb/usb_device.h

Index: device/usb/usb_device.h
diff --git a/device/usb/usb_device.h b/device/usb/usb_device.h
index 53087c8c79ddc5e7fb16f1cf1362824a1f9b513a..44daa58752fbefe783984513a5bed96b8d730dca 100644
--- a/device/usb/usb_device.h
+++ b/device/usb/usb_device.h
@@ -9,11 +9,13 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
+#include "url/gurl.h"
 
 namespace device {
 
 class UsbDeviceHandle;
 struct UsbConfigDescriptor;
+struct WebUsbDescriptorSet;
 
 // A UsbDevice object represents a detected USB device, providing basic
 // information about it. Methods other than simple property accessors must be
@@ -37,6 +39,10 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   }
   const base::string16& product_string() const { return product_string_; }
   const base::string16& serial_number() const { return serial_number_; }
+  const WebUsbDescriptorSet* webusb_allowed_origins() const {
+    return webusb_allowed_origins_.get();
+  }
+  const GURL& webusb_landing_page() const { return webusb_landing_page_; }
 
   // On ChromeOS the permission_broker service is used to change the ownership
   // of USB device nodes so that Chrome can open them. On other platforms these
@@ -68,6 +74,8 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   base::string16 manufacturer_string_;
   base::string16 product_string_;
   base::string16 serial_number_;
+  scoped_ptr<WebUsbDescriptorSet> webusb_allowed_origins_;
+  GURL webusb_landing_page_;
 
  private:
   friend class base::RefCountedThreadSafe<UsbDevice>;