Add WebUSB bindings and client interface [part 2]

public/platform/modules/webusb/WebUSBError.h

 // 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.
 
-#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 {

[dcheng, 2015/07/31 18:58:25]

enum class here as well. You can probably just name this:

enum class Error {
    Device,
    Security,
    Service,
    Transfer,
};

[Ken Rockot(use gerrit already), 2015/07/31 19:14:28]

Done.

-        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)
     {
     }
 
     ErrorType errorType;
     WebString message;
 };
 
 } // namespace blink
 
-#endif // WebSyncError_h
+#endif // WebUSBError_h