Improve LayoutTest output for Errors

LayoutTests/crypto/rsa-oaep-generateKey-parseAlgorithm-failures.html

Index: LayoutTests/crypto/rsa-oaep-generateKey-parseAlgorithm-failures.html
diff --git a/LayoutTests/crypto/rsa-oaep-generateKey-parseAlgorithm-failures.html b/LayoutTests/crypto/rsa-oaep-generateKey-parseAlgorithm-failures.html
index e6a345c5749c4c12c3909edca90a7d4678d9ebe9..00ad2d97efb23604515844f171e7deb93cf0cab0 100644
--- a/LayoutTests/crypto/rsa-oaep-generateKey-parseAlgorithm-failures.html
+++ b/LayoutTests/crypto/rsa-oaep-generateKey-parseAlgorithm-failures.html
@@ -16,30 +16,37 @@ extractable = true;
 keyUsages = ['encrypt', 'decrypt'];
 
 Promise.resolve(null).then(function() {
+    debug("\ngenerateKey() with a modulusLength -30...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP', hash: {name: 'sha-1'}, modulusLength: -30}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with modulusLength NaN...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP', hash: {name: 'sha-1'}, modulusLength: NaN}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() without modulusLength...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP', hash: {name: 'sha-1'}}, extractable, keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() without publicExponent...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP',  hash: {name: 'sha-1'}, modulusLength: 10}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with publicExponent that is an integer...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP',  hash: {name: 'sha-1'}, modulusLength: 10, publicExponent: 10}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with publicExponent that is null...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP', hash: {name: 'sha-1'}, modulusLength: 10, publicExponent: null}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with invalid hash name...");
     return crypto.subtle.generateKey({name: 'RSA-OAEP', hash: {name: 'NOT-A-HASH'}, modulusLength: 10, publicExponent: new Uint8Array(3)}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);