LayoutTest: prepare DevTools console test for V8 change.

The debug() function is going to be extended by a condition string argument.

R=machenbach@chromium.org

Bug: v8:178
Change-Id: I7d9a15bc3f17e9c23e4011d7f4ee55671519df3c
Reviewed-on: https://chromium-review.googlesource.com/975402Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545056}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1456,6 +1456,9 @@ crbug.com/548765 http/tests/devtools/console-fetch-logging.js [ Failure Pass ]
 crbug.com/v8/7486 http/tests/devtools/startup/console/console-format-startup-bigint.js [ Skip ]
 crbug.com/v8/7486 http/tests/devtools/console/console-format-bigint.js [ Skip ]
 
+# Changing signature of console function.
+crbug.com/v8/178 inspector-protocol/console/console-let-const-with-api.js [ NeedsManualRebaseline ]
+
 crbug.com/564109 [ Win ]  http/tests/webfont/font-display-intervention.html [ Pass Failure Timeout ]
 
 crbug.com/399951 http/tests/mime/javascript-mimetype-usecounters.html [ Pass Failure ]

third_party/WebKit/LayoutTests/inspector-protocol/console/console-let-const-with-api-expected.txt

@@ -19,7 +19,7 @@ function inspect(object) { [Command Line API] }
 function copy(value) { [Command Line API] }
 function clear() { [Command Line API] }
 function getEventListeners(node) { [Command Line API] }
-function debug(function) { [Command Line API] }
+function debug(function, condition) { [Command Line API] }
 function undebug(function) { [Command Line API] }
 function monitor(function) { [Command Line API] }
 function unmonitor(function) { [Command Line API] }