DevTools: Initial implementation of line-level CPU profile.

third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 2083 matching lines @@
     case warnings.V8Deopt:
         span.appendChild(WebInspector.linkifyURLAsNode("https://github.com/GoogleChrome/devtools-docs/issues/53",
             WebInspector.UIString("Not optimized"), undefined, true));
         span.createTextChild(WebInspector.UIString(": %s", eventData["deoptReason"]));
         break;
     default:
         console.assert(false, "Unhandled TimelineModel.WarningType");
     }
     return span;
 }
+
+WebInspector.TimelineUIUtils.PerformanceLineMarkerDecorator = function()

[pfeldman, 2016/03/07 19:57:50]

Should implement something.

[alph, 2016/03/08 00:57:43]

Done.

+{
+}
+
+WebInspector.TimelineUIUtils.PerformanceLineMarkerDecorator.prototype = {
+    /**
+     * @param {?} data
+     * @return {!Element}
+     */
+    decorate: function(data)
+    {
+        var info = /** @type {!{text: string, intensity: number}} */ (data);
+        var element = createElementWithClass("div", "text-editor-performance-info");
+        element.textContent = info.text;
+        element.style.backgroundColor = `rgba(255, 0, 0, ${info.intensity.toFixed(3)})`;
+        return element;
+    }
+}