[webcryto] Validate key usages during key creation.

content/child/webcrypto/status.cc

 // Copyright 2014 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.
 
 #include "content/child/webcrypto/status.h"
 
 namespace content {
 
 namespace webcrypto {
 
@@ skipping 180 matching lines @@
   return Status(blink::WebCryptoErrorTypeInvalidAccess,
                 "They key is not extractable");
 }
 
 Status Status::ErrorGenerateKeyLength() {
   return Status(blink::WebCryptoErrorTypeData,
                 "Invalid key length: it is either zero or not a multiple of 8 "
                 "bits");
 }
 
+Status Status::ErrorCreateKeyBadUsages() {
+  return Status(blink::WebCryptoErrorTypeData,
+                "Cannot create a key using the specified key usages.");
+}
+
 Status::Status(blink::WebCryptoErrorType error_type,
                const std::string& error_details_utf8)
     : type_(TYPE_ERROR),
       error_type_(error_type),
       error_details_(error_details_utf8) {
 }
 
 Status::Status(Type type) : type_(type) {
 }
 
 }  // namespace webcrypto
 
 }  // namespace content