[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 3f884d60640e91cabac0ee781666af11f45cb319..b26758849cde77742cd80799f30a3c6f81f7c325 100644
--- a/content/child/webcrypto/platform_crypto.h
+++ b/content/child/webcrypto/platform_crypto.h
@@ -177,6 +177,12 @@ Status ExportKeyRaw(SymKey* key, blink::WebArrayBuffer* buffer);
 Status ExportKeySpki(PublicKey* key, blink::WebArrayBuffer* buffer);
 
 // Preconditions:
+//  * |key| is non-null.
+Status ExportRsaPublicKey(PublicKey* key,
+                          blink::WebArrayBuffer* modulus,

[eroman, 2014/03/21 02:30:51]

Please use a "std::vector<uint8>*" as the output type instead.

Since these buffers don't need to be sent back to Blink, it is both more
convenient and efficient to make them be std::vectors<>.

(WebArrayBuffer is shared by the javascript engine and has extra issues).

[padolph, 2014/03/24 04:24:06]

Done.

+                          blink::WebArrayBuffer* public_exponent);
+
+// Preconditions:
 //  * |wrapping_key| is non-null
 //  * |key| is non-null
 Status WrapSymKeyAesKw(SymKey* wrapping_key,