DevTools: Introduce timeline recording info dialog

Source/devtools/front_end/timeline/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 1047 matching lines @@
     position: absolute;
     right: -2px;
     bottom: 0px;
     border-bottom: 1px solid hsl(0, 100%, 74%);
 }
 
 .timeline-tree-view .data-grid .selected .background-bar {
     background-color: rgba(255,255,255,0.25);
     border-bottom-color: transparent;
 }
+
+.timeline-status-dialog {
+    display: flex;
+    flex-direction: column;
+    padding: 16px;
+    font-size: 14px;
+}
+
+.timeline-status-dialog div,button {
+    margin: 5px;
+}
+
+.timeline-status-dialog .title {
+    align-self: center;
+    font-size: 20px;
+    margin-bottom: 12px;
+}
+
+.timeline-status-dialog ::before {
+    display: inline-block;
+    width: 90px;
+    text-align: right;
+    color: #aaa;
+    margin-right: 10px;
+}
+
+.timeline-status-dialog .status::before {
+    content: "Status";
+}
+
+.timeline-status-dialog .time::before {
+    content: "Time";
+}
+
+.timeline-status-dialog .buffer-usage::before {
+    content: "Buffer Usage";
+}
+
+.timeline-status-dialog .buffer-usage .indicator-container {
+    display: inline-block;
+    width: 200px;
+    height: 12px;
+    background-color: #f4f4f4;
+    display: inline-block;
+    margin: 0;
+    vertical-align: middle;
+}
+
+.timeline-status-dialog .buffer-usage .indicator {
+    background-color: rgb(112, 166, 255);
+    height: 100%;
+    width: 0;
+    margin: 0;
+}
+
+.timeline-status-dialog .stop-button {
+    text-align: center;
+    margin-top: 16px;
+}
+
+.timeline-status-dialog button:disabled {
+    opacity: 0.5;
+}