DevTools: promote large views with overflow to layers in order to not repaint on scroll.

Source/devtools/front_end/dataGrid.css

 .data-grid {
     position: relative;
     border: 1px solid #aaa;
     font-size: 11px;
     line-height: 120%;
 }
 
 .data-grid .highlight {
     background-color: rgb(255, 230, 179);
 }
@@ skipping 10 matching lines @@
 }
 
 .data-grid .data-container {
     position: absolute;
     top: 17px;
     bottom: 0;
     left: 0;
     right: 0;
     overflow-x: hidden;
     overflow-y: overlay;
+    -webkit-transform: translateZ(0);
 }
 
 .data-grid.inline {
     border-left: none;
 }
 
 .data-grid.inline .data-container {
     position: static;
 }
 
@@ skipping 197 matching lines @@
     text-indent: 10px;
 }
 
 .data-grid-resizer {
     position: absolute;
     top: 0;
     bottom: 0;
     width: 5px;
     z-index: 500;
 }