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 abadf001eabe73128b3da19c0ce066462ea39e28..ff69b31212b3351ba6258c96c578c2f34df252d3 100644
--- a/content/child/webcrypto/status.cc
+++ b/content/child/webcrypto/status.cc
@@ -328,6 +328,19 @@ 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::ErrorHkdfDeriveBitsLengthNotSpecified() {
+  // TODO(nharper): The spec might change so that an OperationError should be
+  // thrown here instead of a TypeError.
+  // (https://www.w3.org/Bugs/Public/show_bug.cgi?id=27771)
+  return Status(blink::WebCryptoErrorTypeType,
+                "No length was specified for the HKDF Derive Bits operation.");
+}
+
 Status::Status(blink::WebCryptoErrorType error_type,
                const std::string& error_details_utf8)
     : type_(TYPE_ERROR),