webusb: Reject the promise if the device is already open.

third_party/WebKit/Source/modules/webusb/USBError.cpp

Index: third_party/WebKit/Source/modules/webusb/USBError.cpp
diff --git a/third_party/WebKit/Source/modules/webusb/USBError.cpp b/third_party/WebKit/Source/modules/webusb/USBError.cpp
index 7e203647f7dd654be41d09ec9f9ccba4d0cb0217..7fe34255bbd288c44cb646c2cafe4cd0eb248468 100644
--- a/third_party/WebKit/Source/modules/webusb/USBError.cpp
+++ b/third_party/WebKit/Source/modules/webusb/USBError.cpp
@@ -13,6 +13,8 @@ namespace blink {
 DOMException* USBError::take(ScriptPromiseResolver*, const WebUSBError& webError)
 {
     switch (webError.error) {
+    case WebUSBError::Error::InvalidState:
+        return DOMException::create(InvalidStateError, webError.message);
     case WebUSBError::Error::Network:
         return DOMException::create(NetworkError, webError.message);
     case WebUSBError::Error::NotFound: