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

Source/devtools/front_end/profilesPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 191 matching lines @@
 }
 .profile-canvas-decoration {
     color: red;
     margin: -14px 0 13px 22px;
     padding-left: 14px;
 }
 
 .profile-canvas-decoration button {
     margin: 0 0 0 10px !important;
 }
+
+.overview-container {
+    overflow: hidden;
+    position: absolute;
+    top: 0px;
+    width: 100%;
+    height: 80px;
+    bottom:  0px;
+}