[webcrypto] Add JWK RSA public key export for NSS.

content/child/webcrypto/platform_crypto.h

Index: content/child/webcrypto/platform_crypto.h
diff --git a/content/child/webcrypto/platform_crypto.h b/content/child/webcrypto/platform_crypto.h
index 8c28e3f02b9058427f474f89f38b8ae6a4f8e72e..dac3aba38305f475e9fa52aea5870a1fd84ef480 100644
--- a/content/child/webcrypto/platform_crypto.h
+++ b/content/child/webcrypto/platform_crypto.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_CHILD_WEBCRYPTO_PLATFORM_CRYPTO_H_
 #define CONTENT_CHILD_WEBCRYPTO_PLATFORM_CRYPTO_H_
 
+#include <vector>
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "third_party/WebKit/public/platform/WebArrayBuffer.h"
@@ -178,6 +179,12 @@ Status ExportKeySpki(PublicKey* key, blink::WebArrayBuffer* buffer);
 
 // Preconditions:
 //  * |key| is non-null.
+Status ExportRsaPublicKey(PublicKey* key,
+                          std::vector<uint8>* modulus,
+                          std::vector<uint8>* public_exponent);
+
+// Preconditions:
+//  * |key| is non-null.
 Status ExportKeyPkcs8(PrivateKey* key,
                       const blink::WebCryptoKeyAlgorithm& key_algorithm,
                       blink::WebArrayBuffer* buffer);