Implement HKDF for webcrypto

content/child/webcrypto/status.cc

Index: content/child/webcrypto/status.cc
diff --git a/content/child/webcrypto/status.cc b/content/child/webcrypto/status.cc
index d7732a5182787f725eceeb2ffced0e7caac10a3f..ce8fe0ea11bbdd49b936f4f00d6fc60b69d7fc0d 100644
--- a/content/child/webcrypto/status.cc
+++ b/content/child/webcrypto/status.cc
@@ -323,6 +323,11 @@ Status Status::ErrorEcdhLengthTooBig(unsigned int max_length_bits) {
                     max_length_bits));
 }
 
+Status Status::ErrorHkdfLengthTooLong() {
+  return Status(blink::WebCryptoErrorTypeOperation,
+                "The length provided for HKDF is too large.");
+}
+
 Status::Status(blink::WebCryptoErrorType error_type,
                const std::string& error_details_utf8)
     : type_(TYPE_ERROR),