Devtools Color: Animate drag rearrangement of custom color palette

Source/devtools/front_end/elements/spectrum.css

 /* https://github.com/bgrins/spectrum */
 :host {
     width: 232px;
     height: 240px;
     -webkit-user-select: none;
 }
 
 :host(.palettes-enabled) {
     height: 271px;
 }
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     flex: 0 0 12px;
     display: inline-block;
     border-radius: 2px;
     margin: 6px;
     cursor: pointer;
 }
 
 .spectrum-palette > .spectrum-palette-color {
     transition: transform 100ms cubic-bezier(0, 0, 0.2, 1);
     border: 1px solid rgba(0, 0, 0, 0.1);
+    will-change: transform;
 }
 
 .spectrum-palette > .spectrum-palette-color.empty-color {
     border-color: transparent;
 }
 
 .spectrum-palette > .spectrum-palette-color:not(.empty-color):hover {
     transform: scale(1.15);
 }
 
@@ skipping 83 matching lines @@
     width: 100%;
     height: 100%;
 }
 
 .spectrum-contrast-line {
     fill: none;
     stroke: white;
     opacity: 0.7;
     stroke-width: 1.5px;
 }