Devtools: Resize glpyhs and add animation icons

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 9d0e7a0118c7e15feaaccef2895143174b923141..90b58db8047da6159e23b81587cf2b2de1054c1d 100644
--- a/Source/devtools/front_end/timeline/timelinePanel.css
+++ b/Source/devtools/front_end/timeline/timelinePanel.css
@@ -136,7 +136,7 @@
     display: inline-block;
     -webkit-user-select: none;
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 320px 144px;
+    -webkit-mask-size: 352px 144px;
     width: 10px;
     height: 10px;
     content: "";
@@ -162,7 +162,7 @@
 
 .timeline-expandable-arrow {
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 320px 144px;
+    background-size: 352px 144px;
     opacity: 0.5;
     width: 10px;
     height: 10px;
@@ -212,7 +212,7 @@
 .timeline-tree-item-warning {
     display: block;
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 320px 144px;
+    background-size: 352px 144px;
     width: 10px;
     height: 10px;
     float: right;