[Devtools] Fix hover issue with darktheme in network

third_party/WebKit/Source/devtools/front_end/network/NetworkWaterfallColumn.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 Network.NetworkWaterfallColumn = class extends UI.VBox {
   /**
    * @param {number} rowHeight
    * @param {!Network.NetworkTimeCalculator} calculator
@@ skipping 283 matching lines @@
       this._decorateRow(context, logEntry, i, rowOffset - this._scrollTop);
       if (useTimingBars)
         this._drawTimingBars(context, logEntry, rowOffset - this._scrollTop);
       else
         this._drawSimplifiedBars(context, logEntry, rowOffset - this._scrollTop);
     }
     this._drawEventDividers(context);
     context.restore();
 
     const freeZoneAtLeft = 75;
-    UI.TimelineGrid.drawCanvasGrid(context, this._calculator, this._fontSize, freeZoneAtLeft);
+    const freeZoneAtRight = 18;
+    context.save();

[lushnikov, 2016/11/23 00:16:34]

You don't need context.save / context.restore - it's already done in
drawCanvasGrid()

[allada, 2016/11/23 01:06:03]

Done.

+    UI.TimelineGrid.drawCanvasGrid(context, this._calculator, this._fontSize, this._headerHeight, freeZoneAtLeft);
+    context.clearRect(this._offsetWidth - freeZoneAtRight, 0, freeZoneAtRight, this._headerHeight);
+    context.restore();
     this._didDrawForTest();
   }
 
   /**
    * @param {!CanvasRenderingContext2D} context
    */
   _drawEventDividers(context) {
     context.save();
     context.lineWidth = 1;
     for (var color of this._eventDividers.keys()) {
@@ skipping 298 matching lines @@
   font: 'hsl(8, 100%, 80%)',
   media: 'hsl(90, 50%, 80%)',
   image: 'hsl(90, 50%, 80%)',
   script: 'hsl(31, 100%, 80%)',
   stylesheet: 'hsl(272, 64%, 80%)',
   texttrack: 'hsl(8, 100%, 80%)',
   websocket: 'hsl(0, 0%, 95%)',
   xhr: 'hsl(53, 100%, 80%)',
   other: 'hsl(0, 0%, 95%)'
 };