Enable WebUSB through the Experimental Framework.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1501 matching lines @@
         providePushControllerTo(*m_frame, m_client->pushClient());
 
     provideNotificationPermissionClientTo(*m_frame, NotificationPermissionClientImpl::create());
     provideUserMediaTo(*m_frame, &m_userMediaClientImpl);
     provideGeolocationTo(*m_frame, m_geolocationClientProxy.get());
     m_geolocationClientProxy->setController(GeolocationController::from(m_frame.get()));
     provideMIDITo(*m_frame, MIDIClientProxy::create(m_client ? m_client->webMIDIClient() : nullptr));
     provideLocalFileSystemTo(*m_frame, LocalFileSystemClient::create());
     provideNavigatorContentUtilsTo(*m_frame, NavigatorContentUtilsClientImpl::create(this));
 
+    // Always provided so that availability of the API can be controlled by
+    // OriginTrials::webUSBEnabled().
+    USBController::provideTo(*m_frame, m_client ? m_client->usbClient() : nullptr);
+
     bool enableWebBluetooth = RuntimeEnabledFeatures::webBluetoothEnabled();
 #if OS(CHROMEOS) || OS(ANDROID)
     enableWebBluetooth = true;
 #endif
 
     if (enableWebBluetooth)
         BluetoothSupplement::provideTo(*m_frame, m_client ? m_client->bluetooth() : nullptr);
 
     if (RuntimeEnabledFeatures::screenOrientationEnabled())
         ScreenOrientationController::provideTo(*m_frame, m_client ? m_client->webScreenOrientationClient() : nullptr);
     if (RuntimeEnabledFeatures::presentationEnabled())
         PresentationController::provideTo(*m_frame, m_client ? m_client->presentationClient() : nullptr);
     if (RuntimeEnabledFeatures::permissionsEnabled())
         PermissionController::provideTo(*m_frame, m_client ? m_client->permissionClient() : nullptr);
-    if (RuntimeEnabledFeatures::webUSBEnabled())
-        USBController::provideTo(*m_frame, m_client ? m_client->usbClient() : nullptr);
     if (RuntimeEnabledFeatures::webVREnabled())
         VRController::provideTo(*m_frame, m_client ? m_client->webVRClient() : nullptr);
     if (RuntimeEnabledFeatures::wakeLockEnabled())
         ScreenWakeLock::provideTo(*m_frame, m_client ? m_client->wakeLockClient() : nullptr);
     if (RuntimeEnabledFeatures::audioOutputDevicesEnabled())
         provideAudioOutputDeviceClientTo(*m_frame, AudioOutputDeviceClientImpl::create());
     if (RuntimeEnabledFeatures::installedAppEnabled())
         InstalledAppController::provideTo(*m_frame, m_client ? m_client->installedAppClient() : nullptr);
 }
 
@@ skipping 620 matching lines @@
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 void WebLocalFrameImpl::forceSandboxFlags(WebSandboxFlags flags)
 {
     frame()->loader().forceSandboxFlags(static_cast<SandboxFlags>(flags));
 }
 
 } // namespace blink