[webcrypto] Add raw symmetric key AES-KW wrap/unwrap for NSS.

content/renderer/webcrypto/webcrypto_util.h

Index: content/renderer/webcrypto/webcrypto_util.h
diff --git a/content/renderer/webcrypto/webcrypto_util.h b/content/renderer/webcrypto/webcrypto_util.h
index 111b14b83cf7173c298464b2c286119116f15bb0..e77959059bb82ca44fbf8a51e38d345063b743cc 100644
--- a/content/renderer/webcrypto/webcrypto_util.h
+++ b/content/renderer/webcrypto/webcrypto_util.h
@@ -132,6 +132,11 @@ class CONTENT_EXPORT Status {
   // key's modulus).
   static Status ErrorDataTooLarge();
 
+  // The data provided to an encrypt/decrypt/sign/verify operation was too
+  // small. This usually represents an algorithm restriction (for instance
+  // AES-KW requires a minimum of 24 bytes input data).
+  static Status ErrorDataTooSmall();
+
   // Something was unsupported or unimplemented. This can mean the algorithm in
   // question was unsupported, some parameter combination was unsupported, or
   // something has not yet been implemented.
@@ -147,6 +152,10 @@ class CONTENT_EXPORT Status {
   // (zero length is allowed).
   static Status ErrorInvalidAesGcmTagLength();
 
+  // The input data given to an AES-KW encrypt/decrypt operation was not a
+  // multiple of 8 bytes, as required by RFC 3394.
+  static Status ErrorInvalidAesKwDataLength();
+
   // The "publicExponent" used to generate a key was invalid: either no bytes
   // were specified, or the number was too large to fit into an "unsigned long"
   // (implemention limitation), or the exponent was zero.