WebCrypto: refactor layout tests.

LayoutTests/crypto/resources/common.js

-function importHmacSha1Key()
+function importTestKeys()
 {
     var keyFormat = "spki";
     var data = new Uint8Array([]);
-    var algorithm = {name: 'hmac', hash: {name: 'sha-1'}};
     var extractable = false;
     var keyUsages = ['encrypt', 'decrypt', 'sign', 'verify'];
 
-    return crypto.subtle.importKey(keyFormat, data, algorithm, extractable, keyUsages);
+    var hmacPromise = crypto.subtle.importKey(keyFormat, data, {name: 'hmac', hash: {name: 'sha-1'}}, extractable, keyUsages);
+    var rsaSsaPromise = crypto.subtle.importKey(keyFormat, data, {name: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}}, extractable, keyUsages);
+    var aesCbcPromise = crypto.subtle.importKey(keyFormat, data, {name: 'AES-CBC'}, extractable, keyUsages);
+    var aesCbcJustDecrypt = crypto.subtle.importKey(keyFormat, data, {name: 'AES-CBC'}, extractable, ['decrypt']);
+
+    return Promise.every(hmacPromise, rsaSsaPromise, aesCbcPromise, aesCbcJustDecrypt).then(function(results) {
+        return {
+            hmacSha1: results[0],
+            rsaSsaSha1: results[1],
+            aesCbc: results[2],
+            aesCbcJustDecrypt: results[3],
+        };
+    });
 }
 
 // Builds a hex string representation of any array-like input (array or
 // ArrayBufferView). The output looks like this:
 //    [ab 03 4c 99]
 function byteArrayToHexString(bytes)
 {
     var hexBytes = [];
 
     for (var i = 0; i < bytes.length; ++i) {
         var byteString = bytes[i].toString(16);
         if (byteString.length < 2)
             byteString = "0" + byteString;
         hexBytes.push(byteString);
     }
 
     return "[" + hexBytes.join(" ") + "]";
 }
 
 function asciiToArrayBuffer(str)
 {
     var chars = [];
     for (var i = 0; i < str.length; ++i)
         chars.push(str.charCodeAt(i));
     return new Uint8Array(chars);
 }
 
+function failAndFinishJSTest(error)
+{
+    if (error)
+       debug(error);
+    finishJSTest();
+}