DevTools: bring back old landing page in timeline/performance.

third_party/WebKit/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 13 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 .panel.timeline > .toolbar {
     border-bottom: 1px solid #dadada;
 }
 
+.timeline-settings-pane {
+    flex: none;
+    border-bottom: 1px solid #dadada;
+}
+
 #timeline-overview-panel {
     flex: none;
     position: relative;
     border-bottom: 1px solid rgb(140, 140, 140);
 }
 
 #timeline-overview-panel .timeline-graph-bar {
     pointer-events: none;
 }
 
@@ skipping 26 matching lines @@
 #timeline-container .devtools-link {
     color: inherit;
 }
 
 .timeline-graph-side.hovered {
     background-color: rgba(0, 0, 0, 0.05) !important;
 }
 
 .timeline.panel .status-pane-container {
     z-index: 1000;
-    pointer-events: none;
     display: flex;
     align-items: center;
 }
 
 .timeline.panel .status-pane-container.tinted {
     background-color: hsla(0, 0%, 90%, 0.8);
     pointer-events: auto;
 }
 
 #timeline-overview-panel .overview-strip {
@@ skipping 539 matching lines @@
     background-color: #f3f3f3
 }
 
 .timeline-stack-view-header {
     height: 26px;
     background-color: white;
     padding: 6px 10px;
     color: #5a5a5a;
     white-space: nowrap;
 }
+
+.timeline-landing-page {
+    position: absolute;
+    background-color: white;
+    justify-content: center;
+    align-items: center;
+    overflow: auto;
+    font-size: 13px;
+    color: #777;
+}
+
+.timeline-landing-page > div {
+    width: 430px;
+}
+
+.timeline-landing-page > div > p {
+    flex: none;
+}