Improve LayoutTest output for Errors

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

Index: LayoutTests/crypto/rsa-ssa-generateKey-parseAlgorithm-failures.html
diff --git a/LayoutTests/crypto/rsa-ssa-generateKey-parseAlgorithm-failures.html b/LayoutTests/crypto/rsa-ssa-generateKey-parseAlgorithm-failures.html
index 903b60827882ddab2ddf6a105582c544886dd947..2cff95c7150d009fea979b931f0c7c2292c1e484 100644
--- a/LayoutTests/crypto/rsa-ssa-generateKey-parseAlgorithm-failures.html
+++ b/LayoutTests/crypto/rsa-ssa-generateKey-parseAlgorithm-failures.html
@@ -16,42 +16,52 @@ extractable = true;
 keyUsages = ['sign', 'verify'];
 
 Promise.resolve(null).then(function() {
+    debug("\ngenerateKey() with a modulusLength -30...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}, modulusLength: -30}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with modulusLength NaN...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}, modulusLength: NaN}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() without modulusLength...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() without publicExponent...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', 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: 'RSASSA-PKCS1-v1_5', 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: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}, modulusLength: 10, publicExponent: null}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with modulusLength that is 10...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}, modulusLength: 10, publicExponent: new Uint8Array(0)}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with publicExponent that is 0 bytes long...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', hash: {name: 'sha-1'}, modulusLength: 1024, publicExponent: new Uint8Array(0)}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() with invalid hash name...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', hash: {name: 'NOT-A-HASH'}, modulusLength: 10, publicExponent: new Uint8Array(3)}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\ngenerateKey() without hash name...");
     return crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', modulusLength: 10, publicExponent: new Uint8Array(3)}, extractable , keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);