Add --disable-webusb-security flag for testing existing devices.

chrome/browser/usb/web_usb_permission_provider.cc

 // 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 "chrome/browser/usb/web_usb_permission_provider.h"
 
 #include <stddef.h>
 #include <utility>
 
+#include "base/command_line.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/usb/usb_chooser_context.h"
 #include "chrome/browser/usb/usb_chooser_context_factory.h"
+#include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "device/usb/public/interfaces/device.mojom.h"
 
 using content::WebContents;
 using device::usb::WebUsbDescriptorSet;
 using device::usb::WebUsbConfigurationSubsetPtr;
 using device::usb::WebUsbFunctionSubsetPtr;
 
 namespace {
 
 bool FindOriginInDescriptorSet(const WebUsbDescriptorSet* set,
                                const GURL& origin,
                                const uint8_t* configuration_value,
                                const uint8_t* interface_number) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableWebUsbSecurity))
+    return true;
+
   if (!set)
     return false;
   for (size_t i = 0; i < set->origins.size(); ++i)
     if (origin.spec() == set->origins[i])
       return true;
   for (size_t i = 0; i < set->configurations.size(); ++i) {
     const WebUsbConfigurationSubsetPtr& config = set->configurations[i];
     if (configuration_value &&
         *configuration_value != config->configuration_value)
       continue;
@@ skipping 63 matching lines @@
 bool WebUSBPermissionProvider::HasInterfacePermission(
     uint8_t requested_interface,
     uint8_t configuration_value,
     const device::usb::DeviceInfo& device_info) const {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   return FindOriginInDescriptorSet(
       device_info.webusb_allowed_origins.get(),
       render_frame_host_->GetLastCommittedURL().GetOrigin(),
       &configuration_value, &requested_interface);
 }