[Devtools] Fix hover issue with darktheme in network

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

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkWaterfallColumn.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkWaterfallColumn.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkWaterfallColumn.js
index 7afccc71b088b766d2304b84f163b3448053d4f7..3d01ddac297dd9166bcf41e699114db51b3d4f49 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkWaterfallColumn.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkWaterfallColumn.js
@@ -301,7 +301,11 @@ Network.NetworkWaterfallColumn = class extends UI.VBox {
     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();
   }