Devtools Animations: Basic animation inspection & control in Styles pane

Source/devtools/front_end/elementsPanel.css

Index: Source/devtools/front_end/elementsPanel.css
diff --git a/Source/devtools/front_end/elementsPanel.css b/Source/devtools/front_end/elementsPanel.css
index 53e0da4ad7f4143d82e75f8f9606c3f59204e867..69f2b3cc0c14e03135190e7e94be7a73adbcc257 100644
--- a/Source/devtools/front_end/elementsPanel.css
+++ b/Source/devtools/front_end/elementsPanel.css
@@ -793,3 +793,11 @@ li.child-editing .styles-clipboard-only {
     overflow: hidden;
     line-height: 16px;
 }
+
+.animation-pause .glyph {
+    -webkit-mask-position: -32px -72px;
+}
+
+.animation-pause.toggled-on .glyph {
+    -webkit-mask-position: 0 -72px;
+}