Catch uncaught promise rejections from V8 and log to console.

LayoutTests/http/tests/inspector/console-test.js

 var initialize_ConsoleTest = function() {
 
 InspectorTest.preloadPanel("console");
 
 InspectorTest.evaluateInConsole = function(code, callback)
 {
     callback = InspectorTest.safeWrap(callback);
 
     var consoleView = WebInspector.ConsolePanel._view();
     consoleView.visible = true;
@@ skipping 56 matching lines @@
 {
     var viewport = WebInspector.ConsolePanel._view()._viewport;
     viewport.element.style.width = width + "px";
     viewport.element.style.height = height + "px";
     viewport.element.style.position = "absolute";
     viewport.invalidate();
 }
 
 InspectorTest.dumpConsoleMessages = function(printOriginatingCommand, dumpClassNames, formatter)
 {
+    InspectorTest.addResults(InspectorTest.dumpConsoleMessagesIntoArray(printOriginatingCommand, dumpClassNames, formatter));
+}
+
+InspectorTest.dumpConsoleMessagesIntoArray = function(printOriginatingCommand, dumpClassNames, formatter)
+{
     formatter = formatter || InspectorTest.prepareConsoleMessageText;
     var result = [];
     InspectorTest.disableConsoleViewport();
     var consoleView = WebInspector.ConsolePanel._view();
     if (consoleView._needsFullUpdate)
         consoleView._updateMessageList();
     var viewMessages = consoleView._visibleViewMessages;
     for (var i = 0; i < viewMessages.length; ++i) {
         var uiMessage = viewMessages[i];
         var message = uiMessage.consoleMessage();
         var element = uiMessage.contentElement();
 
         if (dumpClassNames) {
             var classNames = [];
             for (var node = element.firstChild; node; node = node.traverseNextNode(element)) {
                 if (node.nodeType === Node.ELEMENT_NODE && node.className)
                     classNames.push(node.className);
             }
         }
 
-        if (InspectorTest.dumpConsoleTableMessage(uiMessage, false)) {
+        if (InspectorTest.dumpConsoleTableMessage(uiMessage, false, result)) {
             if (dumpClassNames)
-                InspectorTest.addResult(classNames.join(" > "));
+                result.push(classNames.join(" > "));
         } else {
             var messageText = formatter(element, message);
-            InspectorTest.addResult(messageText + (dumpClassNames ? " " + classNames.join(" > ") : ""));
+            result.push(messageText + (dumpClassNames ? " " + classNames.join(" > ") : ""));
         }
 
         if (printOriginatingCommand && uiMessage.consoleMessage().originatingMessage())
-            InspectorTest.addResult("Originating from: " + uiMessage.consoleMessage().originatingMessage().messageText);
+            result.push("Originating from: " + uiMessage.consoleMessage().originatingMessage().messageText);
     }
     return result;
 }
 
-InspectorTest.dumpConsoleTableMessage = function(viewMessage, forceInvalidate)
+InspectorTest.dumpConsoleTableMessage = function(viewMessage, forceInvalidate, results)
 {
     if (forceInvalidate)
         WebInspector.ConsolePanel._view()._viewport.invalidate();
     var table = viewMessage.contentElement();
     var headers = table.querySelectorAll("th div");
     if (!headers.length)
         return false;
 
     var headerLine = "";
     for (var i = 0; i < headers.length; i++)
         headerLine += headers[i].textContent + " | ";
 
-    InspectorTest.addResult("HEADER " + headerLine);
+    addResult("HEADER " + headerLine);
 
     var rows = table.querySelectorAll(".data-container tr");
 
     for (var i = 0; i < rows.length; i++) {
         var row = rows[i];
         var rowLine = "";
         var items = row.querySelectorAll("td > span");
         for (var j = 0; j < items.length; j++)
             rowLine += items[j].textContent + " | ";
 
         if (rowLine.trim())
-            InspectorTest.addResult("ROW " + rowLine);
+            addResult("ROW " + rowLine);
     }
+
+    function addResult(x)
+    {
+        if (results)
+            results.push(x);
+        else
+            InspectorTest.addResult(x);
+    }
+
     return true;
 }
 
 InspectorTest.dumpConsoleMessagesWithStyles = function(sortMessages)
 {
     var result = [];
     var messageViews = WebInspector.ConsolePanel._view()._visibleViewMessages;
     for (var i = 0; i < messageViews.length; ++i) {
         var element = messageViews[i].contentElement();
         var messageText = InspectorTest.prepareConsoleMessageText(element)
@@ skipping 108 matching lines @@
     }
     if (!option) {
         InspectorTest.addResult("FAILED: context with prefix: "  + namePrefix + " not found in the context list");
         return;
     }
     option.selected = true;
     WebInspector.ConsolePanel._view()._executionContextChanged();
 }
 
 }