Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/inspectorStyle.css

Index: Source/devtools/front_end/inspectorStyle.css
diff --git a/Source/devtools/front_end/inspectorStyle.css b/Source/devtools/front_end/inspectorStyle.css
index de2b05bbfd83f5d032a3b91c6297192dc94cb8d2..d2e556c856f8d3557b2e2dc6302725aaf47063be 100644
--- a/Source/devtools/front_end/inspectorStyle.css
+++ b/Source/devtools/front_end/inspectorStyle.css
@@ -211,7 +211,7 @@ ol.outline-disclosure:focus li.selected * {
     float: left;
     -webkit-user-select: none;
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 352px 144px;
+    -webkit-mask-size: 352px 168px;
     content: "a";
     color: transparent;
     text-shadow: none;
@@ -365,7 +365,7 @@ ol.outline-disclosure:focus li.selected * {
     height: 10px;
     border: 0;
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 352px 144px;
+    -webkit-mask-size: 352px 168px;
     -webkit-appearance: none;
     background-color: rgba(0, 0, 0, 0.75);
     position: relative;