[webcrypto] Make operations run on worker threads.

content/child/webcrypto/jwk.h

Index: content/child/webcrypto/jwk.h
diff --git a/content/child/webcrypto/jwk.h b/content/child/webcrypto/jwk.h
index 17bf59ed80284d7acbe2095cf0bb283bb6ebacbe..c9191888256d957f56c00da4bebe970307cca9c3 100644
--- a/content/child/webcrypto/jwk.h
+++ b/content/child/webcrypto/jwk.h
@@ -5,6 +5,9 @@
 #ifndef CONTENT_CHILD_WEBCRYPTO_JWK_H_
 #define CONTENT_CHILD_WEBCRYPTO_JWK_H_
 
+#include <vector>
+
+#include "base/basictypes.h"
 #include "third_party/WebKit/public/platform/WebArrayBuffer.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
@@ -22,8 +25,7 @@ Status ImportKeyJwk(const CryptoData& key_data,
                     blink::WebCryptoKeyUsageMask usage_mask,
                     blink::WebCryptoKey* key);
 
-Status ExportKeyJwk(const blink::WebCryptoKey& key,
-                    blink::WebArrayBuffer* buffer);
+Status ExportKeyJwk(const blink::WebCryptoKey& key, std::vector<uint8>* buffer);
 
 }  // namespace webcrypto