Display average time between collections

runtime/bin/vmservice/client/lib/src/elements/heap_profile.html

Index: runtime/bin/vmservice/client/lib/src/elements/heap_profile.html
diff --git a/runtime/bin/vmservice/client/lib/src/elements/heap_profile.html b/runtime/bin/vmservice/client/lib/src/elements/heap_profile.html
index c4d73049e6b4b8dcd70dd75ddd61c855c74624f4..f6a324e1692ed510058d2d29e6fddffc7cf2c9d7 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/heap_profile.html
+++ b/runtime/bin/vmservice/client/lib/src/elements/heap_profile.html
@@ -89,17 +89,21 @@
             </div>
           </div>
           <div class="memberItem">
-            <div class="memberName">Collections</div>
+            <div class="memberName">collections</div>
             <div class="memberValue">{{ formattedCollections(true) }}</div>
           </div>
           <div class="memberItem">
-            <div class="memberName">Average Collection Time</div>
+            <div class="memberName">average collection time</div>
             <div class="memberValue">{{ formattedAverage(true) }}</div>
           </div>
           <div class="memberItem">
-            <div class="memberName">Cumulative Collection Time</div>
+            <div class="memberName">cumulative collection time</div>
             <div class="memberValue">{{ formattedTotalCollectionTime(true) }}</div>
           </div>
+          <div class="memberItem">
+            <div class="memberName">average time between collections</div>
+            <div class="memberValue">{{ isolate.newSpace.averageCollectionPeriodInMillis.toStringAsFixed(2) }} ms</div>
+          </div>
         </div>
         <div id="newPieChart" style="height: 300px"></div>
       </div>
@@ -122,17 +126,21 @@
             </div>
           </div>
           <div class="memberItem">
-            <div class="memberName">Collections</div>
+            <div class="memberName">collections</div>
             <div class="memberValue">{{ formattedCollections(false) }}</div>
           </div>
           <div class="memberItem">
-            <div class="memberName">Average Collection Time</div>
+            <div class="memberName">average collection time</div>
             <div class="memberValue">{{ formattedAverage(false) }}</div>
           </div>
           <div class="memberItem">
-            <div class="memberName">Cumulative Collection Time</div>
+            <div class="memberName">cumulative collection time</div>
             <div class="memberValue">{{ formattedTotalCollectionTime(false) }}</div>
           </div>
+          <div class="memberItem">
+            <div class="memberName">average time between collections</div>
+            <div class="memberValue">{{ isolate.oldSpace.averageCollectionPeriodInMillis.toStringAsFixed(2) }} ms</div>
+          </div>
         </div>
         <div id="oldPieChart" style="height: 300px"></div>
       </div>