[webcrypto] Validate JWK import of AES keys: key length must match algorithm.

content/renderer/webcrypto/webcrypto_util.cc

Index: content/renderer/webcrypto/webcrypto_util.cc
diff --git a/content/renderer/webcrypto/webcrypto_util.cc b/content/renderer/webcrypto/webcrypto_util.cc
index 4c58125e34699801ec90260a6cb3ce56f1d4e00f..42e7b20465ad2086b773d5a39fc8e436f76d6af3 100644
--- a/content/renderer/webcrypto/webcrypto_util.cc
+++ b/content/renderer/webcrypto/webcrypto_util.cc
@@ -92,6 +92,11 @@ Status Status::ErrorJwkUnrecognizedKty() {
   return Status("The JWK \"kty\" property was unrecognized");
 }
 
+Status Status::ErrorJwkIncorrectKeyLength() {
+  return Status("The JWK \"k\" property did not include the right length "
+                "of key data for the given algorithm.");
+}
+
 Status Status::ErrorImportEmptyKeyData() {
   return Status("No key data was provided");
 }