Improve LayoutTest output for Errors

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

Index: LayoutTests/crypto/aes-ctr-parseAlgorithm-failures.html
diff --git a/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures.html b/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures.html
index 7e64d5943945be0226f7e4c07701cd42e7a55a35..38ce269480853b0133c20d74393f7e630769d828 100644
--- a/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures.html
+++ b/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures.html
@@ -23,30 +23,37 @@ Promise.resolve(null).then(function(result) {
     // FIXME: Should use aes-ctr here.
     var algorithm = {name: 'aes-cbc'};
 
+    debug("\nImporting AES-CBC key...");
     return crypto.subtle.importKey('raw', keyData, algorithm, extractable, usages);
 }).then(function(result) {
     key = result;
 
+    debug("\nencrypt() with counter null...");
     return crypto.subtle.encrypt({name: 'AES-CTR', counter: null}, key, data);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\nencrypt() without counter...");
     return crypto.subtle.encrypt({name: 'AES-CTR'}, key, data);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\nencrypt() without length...");
     return crypto.subtle.encrypt({name: 'AES-CTR', counter: new Uint8Array(0)}, key, data);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\nencrypt() with a length of 256...");
     return crypto.subtle.encrypt({name: 'AES-CTR', counter: new Uint8Array(16), length: 256}, key, data);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\nencrypt() with a length of -3...");
     return crypto.subtle.encrypt({name: 'AES-CTR', counter: new Uint8Array(16), length: -3}, key, data);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);
 
+    debug("\nencrypt() with length that is Infinity...");
     return crypto.subtle.encrypt({name: 'AES-CTR', counter: new Uint8Array(16), length: Infinity}, key, data);
 }).then(failAndFinishJSTest, function(result) {
     logError(result);