Dashboard - Add close button to chart-toolip.

dashboard/dashboard/elements/chart-tooltip.html

Index: dashboard/dashboard/elements/chart-tooltip.html
diff --git a/dashboard/dashboard/elements/chart-tooltip.html b/dashboard/dashboard/elements/chart-tooltip.html
index 1660a3d8ec6bd1f92761c4d1808307a8d7043f27..8fd815093339f9c54f8eabc89041d0623b48b38b 100644
--- a/dashboard/dashboard/elements/chart-tooltip.html
+++ b/dashboard/dashboard/elements/chart-tooltip.html
@@ -33,6 +33,13 @@ was just clicked.
       overflow-y: auto;
       max-height: 250px;
     }
+
+    .close-icon {
+      cursor: pointer;
+      position: absolute;
+      top: 4px;
+      right: 4px;
+    }
   </style>
 
   <template>
@@ -64,6 +71,10 @@ was just clicked.
             </div>
           </template>
 
+          <div class="close-icon" on-click="close">
+            ❌ <!-- cross mark U+274C -->
+          </div>
+
           <div id="test-name">
             Test: {{parentPath}}/<b>{{seriesName}}</b>
           </div>