DevTools: Make tracking entry info on flame chart work with pan/zoom.

third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css

 .flame-chart-main-pane {
     overflow: hidden;
 }
 
 .flame-chart-marker-highlight-element {
     position: absolute;
     top: 0;
     height: 20px;
     width: 4px;
     margin: 0 -2px;
@@ skipping 42 matching lines @@
 
 .flame-chart-selection-overlay .time-span {
     white-space: nowrap;
     position: absolute;
     left: 0;
     right: 0;
     bottom: 0;
 }
 
 .flame-chart-entry-info:not(:empty) {
-    z-index: 100;
+    z-index: 200;
     margin: 6px 10px;
     position: absolute;
     background-color: white;
     pointer-events: none;
     padding: 2px;
     box-shadow: hsla(0, 0%, 0%, 0.4) 1px 1px 8px;
 }
 
 .flame-chart-entry-info table tr td:empty {
     padding: 0;
@@ skipping 12 matching lines @@
     margin-right: 5px;
 }
 
 .flame-chart-entry-info table tr td span.timeline-network-info-duration {
     color: darkgreen;
 }
 
 .flame-chart-entry-info table tr td span.timeline-network-info-method {
     color: darkblue;
 }