Improve LayoutTest output for Errors

LayoutTests/crypto/aes-ctr-generateKey-parseAlgorithm-failures.html

Index: LayoutTests/crypto/aes-ctr-generateKey-parseAlgorithm-failures.html
diff --git a/LayoutTests/crypto/aes-ctr-generateKey-parseAlgorithm-failures.html b/LayoutTests/crypto/aes-ctr-generateKey-parseAlgorithm-failures.html
index 2d2c24eb377a21544a6526fa7a6a04e58b1a5d5e..fcf4767699b851c7ad4d28fd4650e1ad30137a90 100644
--- a/LayoutTests/crypto/aes-ctr-generateKey-parseAlgorithm-failures.html
+++ b/LayoutTests/crypto/aes-ctr-generateKey-parseAlgorithm-failures.html
@@ -16,18 +16,22 @@ extractable = true;
 keyUsages = ['encrypt', 'decrypt'];
 
 Promise.resolve(null).then(function() {
+    debug("\ngenerateKey() without length...");
     return crypto.subtle.generateKey({ name: 'aes-ctr' }, extractable, keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with length larger than an octet...");

[eroman, 2014/12/12 19:37:01]

Please mention the exact length used (70000)
(since part of the verification is ensuring that is in fact outside of octet
range)

[Paritosh Kumar, 2014/12/15 08:21:26]

Done.

     return crypto.subtle.generateKey({ name: 'aes-ctr', length: 70000 }, extractable, keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with negative length...");

[eroman, 2014/12/12 19:37:01]

mention exact length

[Paritosh Kumar, 2014/12/15 08:21:26]

Done.

     return crypto.subtle.generateKey({ name: 'aes-ctr', length: -3 }, extractable, keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with length that is minus Infinity...");
     return crypto.subtle.generateKey({ name: 'aes-ctr', length: -Infinity }, extractable, keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);