Add WebUSB bindings and client interface [part 2]

public/platform/modules/webusb/WebUSBError.h

Index: public/platform/modules/webusb/WebUSBError.h
diff --git a/public/platform/modules/background_sync/WebSyncError.h b/public/platform/modules/webusb/WebUSBError.h
similarity index 54%
copy from public/platform/modules/background_sync/WebSyncError.h
copy to public/platform/modules/webusb/WebUSBError.h
index cf537ad304dd119a19d82831846dafced3270600..d9a636e2b46900c584755be75935bd2aa37eefe7 100644
--- a/public/platform/modules/background_sync/WebSyncError.h
+++ b/public/platform/modules/webusb/WebUSBError.h
@@ -2,23 +2,24 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef WebSyncError_h
-#define WebSyncError_h
+#ifndef WebUSBError_h
+#define WebUSBError_h
 
 #include "public/platform/WebString.h"
 
 namespace blink {
 
-struct WebSyncError {
+// Error object used to create DOMExceptions when a Web USB request cannot be
+// satisfied.
+struct WebUSBError {
     enum ErrorType {
-        ErrorTypeAbort = 0,
-        ErrorTypeNoPermission,
-        ErrorTypeNotFound,
-        ErrorTypeUnknown,
-        ErrorTypeLast = ErrorTypeUnknown
+        DeviceError,
+        SecurityError,
+        ServiceError,
+        TransferError,
     };
 
-    WebSyncError(ErrorType errorType, const WebString& message)
+    WebUSBError(ErrorType errorType, const WebString& message)
         : errorType(errorType)
         , message(message)
     {
@@ -30,4 +31,4 @@ struct WebSyncError {
 
 } // namespace blink
 
-#endif // WebSyncError_h
+#endif // WebUSBError_h