Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/timeline/timelinePanel.css

Index: Source/devtools/front_end/timeline/timelinePanel.css
diff --git a/Source/devtools/front_end/timeline/timelinePanel.css b/Source/devtools/front_end/timeline/timelinePanel.css
index 186c30d6a995b3ea41e00ac9516912208a6006ba..a85fb1ce32d2b73fe6686445a9eb5f36ad31c07d 100644
--- a/Source/devtools/front_end/timeline/timelinePanel.css
+++ b/Source/devtools/front_end/timeline/timelinePanel.css
@@ -140,7 +140,7 @@
     display: inline-block;
     -webkit-user-select: none;
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 352px 144px;
+    -webkit-mask-size: 352px 168px;
     width: 10px;
     height: 10px;
     content: "";
@@ -166,7 +166,7 @@
 
 .timeline-expandable-arrow {
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     opacity: 0.5;
     width: 10px;
     height: 10px;
@@ -216,7 +216,7 @@
 .timeline-tree-item-warning {
     display: block;
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     width: 10px;
     height: 10px;
     float: right;