DevTools: Highlight DOM node on hover in flamechart.

third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js

Index: third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js
diff --git a/third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js b/third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js
index 2d334da82dd3f9289c5ed8ec86c39f998c6a3c31..57ddf918da548011ec884ef61ddc9ccdacabe046 100644
--- a/third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js
+++ b/third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js
@@ -165,12 +165,14 @@ PerfUI.FlameChart = class extends PerfUI.ChartViewport {
       return;
     this._highlightedEntryIndex = entryIndex;
     this._updateElementPosition(this._highlightElement, this._highlightedEntryIndex);
+    this._dataProvider.highlightEntry(entryIndex);
   }
 
   hideHighlight() {
     this._entryInfo.removeChildren();
     this._highlightedEntryIndex = -1;
     this._updateElementPosition(this._highlightElement, this._highlightedEntryIndex);
+    this._dataProvider.highlightEntry(-1);
   }
 
   _resetCanvas() {
@@ -1340,6 +1342,11 @@ PerfUI.FlameChartDataProvider.prototype = {
 
   /**
    * @param {number} entryIndex
+   */
+  highlightEntry(entryIndex) {},
+
+  /**
+   * @param {number} entryIndex
    * @return {boolean}
    */
   forceDecoration(entryIndex) {},