DevTools: Add timestamp support in the console

Source/devtools/front_end/ConsoleViewMessage.js

Index: Source/devtools/front_end/ConsoleViewMessage.js
diff --git a/Source/devtools/front_end/ConsoleViewMessage.js b/Source/devtools/front_end/ConsoleViewMessage.js
index dddeab7444566183073b925614cb308b15d357b9..e5346dcabd3e99fe41716e09c6d4640fa9e4ae62 100644
--- a/Source/devtools/front_end/ConsoleViewMessage.js
+++ b/Source/devtools/front_end/ConsoleViewMessage.js
@@ -50,6 +50,8 @@ WebInspector.ConsoleViewMessage = function(consoleMessage, linkifier)
         "node":   this._formatParameterAsNode,
         "string": this._formatParameterAsString
     };
+
+    WebInspector.settings.consoleTimestampsEnabled.addChangeListener(this._consoleTimestampsSettingChanged, this);
 }
 
 WebInspector.ConsoleViewMessage.prototype = {
@@ -843,6 +845,28 @@ WebInspector.ConsoleViewMessage.prototype = {
         return regexObject.test(this._formattedMessageText()) || (!!this._anchorElement && regexObject.test(this._anchorElement.textContent));
     },
 
+    _updateTimestamp: function(show)
+    {
+        if (!this._element)
+            return;
+
+        if (show && !this.timestampElement) {
+            this.timestampElement = this._element.createChild("span", "console-timestamp");
+            this.timestampElement.textContent = (new Date(this._message.timestamp)).toConsoleTime();
+            var afterRepeatCountChild = this.repeatCountElement && this.repeatCountElement.nextSibling;
+            this._element.insertBefore(this.timestampElement, afterRepeatCountChild || this._element.firstChild);

[apavlov, 2014/03/21 14:47:58]

you can add a return; after this line, since the remaining code is the exact
opposite

+        }
+
+        if (!show && this.timestampElement)
+            this.timestampElement.remove();
+    },
+
+    _consoleTimestampsSettingChanged: function(event)
+    {
+        var enabled = /** @type {boolean} */ (event.data);
+        this._updateTimestamp(enabled);
+    },
+
     /**
      * @return {!Element}
      */
@@ -882,6 +906,7 @@ WebInspector.ConsoleViewMessage.prototype = {
 
         if (this._message.repeatCount > 1)
             this.updateRepeatCount();
+        this._updateTimestamp(WebInspector.settings.consoleTimestampsEnabled.get());
 
         return element;
     },