[Devtools] Added hover support for network timeline experiment

third_party/WebKit/Source/devtools/front_end/network/networkLogView.css

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 606 matching lines @@
 
 #network-container {
     overflow: hidden;
 }
 
 /* Brief mode peculiarities. */
 #network-container.brief-mode .network-timeline-grid {
     display: none;
 }
 
-.network-log-grid.data-grid .data-container tr:not(.data-grid-filler-row):not(.selected):hover {
-    background-color: rgba(56, 121, 217, 0.1);
+.network-log-grid.data-grid .data-container tr:not(.data-grid-filler-row):not(.selected).hover {
+    background-color: #ebf2fc;
 }
 
 .network-log-grid .network-node-on-initiator-path {
     background-color: hsla(120, 68%, 54%, 0.2) !important;
 }
 
 .network-log-grid .network-node-on-initiated-path {
     background-color: hsla(0, 68%, 54%, 0.2) !important;
 }
 
@@ skipping 60 matching lines @@
 
 .network-timeline-header .sort-ascending.sort-order-icon {
     display: block;
     background-position: -4px -111px;
 }
 
 .network-timeline-header .sort-descending.sort-order-icon {
     display: block;
     background-position: -20px -99px;
 }