[WebCrypto] Throw syntaxError if keyUsage is empty in ImportKey

content/child/webcrypto/openssl/hmac_openssl.cc

Index: content/child/webcrypto/openssl/hmac_openssl.cc
diff --git a/content/child/webcrypto/openssl/hmac_openssl.cc b/content/child/webcrypto/openssl/hmac_openssl.cc
index 76f63c3236818e539f11baed09808b6cbd6fb484..20003c4776ca7afa52f99d48e9e73d9f1afba131 100644
--- a/content/child/webcrypto/openssl/hmac_openssl.cc
+++ b/content/child/webcrypto/openssl/hmac_openssl.cc
@@ -70,7 +70,7 @@ class HmacImplementation : public AlgorithmImplementation {
                      bool extractable,
                      blink::WebCryptoKeyUsageMask usages,
                      GenerateKeyResult* result) const override {
-    Status status = CheckKeyCreationUsages(kAllKeyUsages, usages);
+    Status status = CheckKeyCreationUsages(kAllKeyUsages, usages, false);

[eroman, 2014/12/09 21:04:46]

Same comment as earlier.

     if (status.IsError())
       return status;
 
@@ -94,7 +94,7 @@ class HmacImplementation : public AlgorithmImplementation {
     switch (format) {
       case blink::WebCryptoKeyFormatRaw:
       case blink::WebCryptoKeyFormatJwk:
-        return CheckKeyCreationUsages(kAllKeyUsages, usages);
+        return CheckKeyCreationUsages(kAllKeyUsages, usages, true);
       default:
         return Status::ErrorUnsupportedImportKeyFormat();
     }