DevTools: draw load/first paint marks as tall vertical delimiters

Source/devtools/front_end/profiler/CPUProfileFlameChart.js

Index: Source/devtools/front_end/profiler/CPUProfileFlameChart.js
diff --git a/Source/devtools/front_end/profiler/CPUProfileFlameChart.js b/Source/devtools/front_end/profiler/CPUProfileFlameChart.js
index 6e644a6dfcec0733fea515321d1c513f7c07d54c..ecd2e02bc74d36a1b5b9ce4a4ad02a5162ad4763 100644
--- a/Source/devtools/front_end/profiler/CPUProfileFlameChart.js
+++ b/Source/devtools/front_end/profiler/CPUProfileFlameChart.js
@@ -129,6 +129,15 @@ WebInspector.CPUFlameChartDataProvider.prototype = {
     },
 
     /**
+     * @param {number} index
+     * @return {boolean}
+     */
+    isTallMarker: function(index)
+    {
+        throw new Error("Unreachable.");
+    },
+
+    /**
      * @return {!WebInspector.FlameChart.TimelineData}
      */
     _calculateTimelineData: function()