DevTools: [TrackingHeapProfiler] Provide a chart with living heap date at recording time.

Source/devtools/front_end/heapProfiler.css

Index: Source/devtools/front_end/heapProfiler.css
diff --git a/Source/devtools/front_end/heapProfiler.css b/Source/devtools/front_end/heapProfiler.css
index 9870fb41402e65647f8f3c0702ebc2ea754e4ed9..afa9ebefbe0924a0381b384a53b6a21fab727dbd 100644
--- a/Source/devtools/front_end/heapProfiler.css
+++ b/Source/devtools/front_end/heapProfiler.css
@@ -271,22 +271,10 @@ table.heap-snapshot-help {
     top: 80px;
 }
 
-.overview-container {
-    overflow: hidden;
-    position: absolute;
-    top: 0px;
-    width: 100%;
-    height: 80px;
-}
-
 #heap-recording-overview-grid .resources-dividers-label-bar {
     pointer-events: auto;
 }
 
-#heap-recording-overview-container {
-    border-bottom: 1px solid rgba(0, 0, 0, 0.3);
-}
-
 .heap-recording-overview-canvas {
     position: absolute;
     top: 20px;
@@ -294,3 +282,11 @@ table.heap-snapshot-help {
     right: 0;
     bottom: 0;
 }
+
+#profile-views .heap-snapshot-view #heap-recording-view .overview-container {
+    height: 80px;
+}
+
+#profile-views #heap-recording-view .overview-container {
+    height: 100%;
+}