Enable the WebUSB Origin Trial.

third_party/WebKit/Source/bindings/modules/v8/V8BindingForModules.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 593 matching lines @@
 
     if (!originTrialContext->featureBindingsInstalled("WebBluetooth") && (RuntimeEnabledFeatures::webBluetoothEnabled() || originTrialContext->isFeatureEnabled("WebBluetooth"))) {
         if (executionContext->isDocument()) {
             // For global interfaces e.g. BluetoothUUID.
             V8WindowPartial::installWebBluetooth(scriptState, global);
             // For navigator interfaces e.g. navigator.bluetooth.
             V8NavigatorPartial::installWebBluetooth(scriptState);
         }
     }
 
+    if (!originTrialContext->featureBindingsInstalled("WebUSB") && (RuntimeEnabledFeatures::webUSBEnabled() || originTrialContext->isFeatureEnabled("WebUSB"))) {
+        if (executionContext->isDocument()) {
+            // For global interfaces e.g. USBInterface.
+            V8WindowPartial::installWebUSB(scriptState, global);
+            // For navigator interfaces e.g. navigator.usb.
+            V8NavigatorPartial::installWebUSB(scriptState);
+        }
+    }
+
+
     if (!originTrialContext->featureBindingsInstalled("ForeignFetch") && (RuntimeEnabledFeatures::foreignFetchEnabled() || originTrialContext->isFeatureEnabled("ForeignFetch"))) {
         if (executionContext->isServiceWorkerGlobalScope()) {
             V8ServiceWorkerGlobalScope::installForeignFetch(scriptState, global);
         }
     }
 }
 
 void registerInstallOriginTrialsForModules()
 {
     s_originalInstallOriginTrialsFunction = setInstallOriginTrialsFunction(&installOriginTrialsForModules);
 }
 } // namespace blink