[DevTools] Add minimum size to WebInspector.View.

Source/devtools/front_end/timelinePanel.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 691 matching lines @@
     text-align: right;
     white-space: nowrap;
 }
 
 .timeline-details-row-data {
     white-space: nowrap;
 }
 
 .timeline-details-view {
     color: #333;
+    overflow: hidden;
 }
 
 .timeline-details-view-title {
     padding: 2px 5px;
     flex: 0 0 19px;
     border-bottom: 1px solid rgb(202, 202, 202);
     background-color: rgb(236, 236, 236);
     white-space: nowrap;
     display: flex;
     color: rgb(92, 110, 129);
@@ skipping 79 matching lines @@
     display: none;
 }
 
 .timeline-flamechart-view .flame-chart-main-pane .resources-divider-label {
     text-align: center;
 }
 
 .timeline-flamechart {
     overflow: hidden;
 }