DevTools: Initial implementation of line-level CPU profile.

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

Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js
index 7cdc39252c448b7e16b557380db3dcd374154e7e..29b889342186e1f8e12257fb88c37567990e7bf7 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js
@@ -2101,3 +2101,22 @@ WebInspector.TimelineUIUtils.eventWarning = function(event, 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;
+    }
+}