Add scroll-blocks-on support to devtools layers view

Source/devtools/front_end/timeline/LayerDetailsView.js

Index: Source/devtools/front_end/timeline/LayerDetailsView.js
diff --git a/Source/devtools/front_end/timeline/LayerDetailsView.js b/Source/devtools/front_end/timeline/LayerDetailsView.js
index 333562d643dc2d3eab63a4987773acaa16221981..cec25338c7014106254d01c5ecee7cc941bd85ad 100644
--- a/Source/devtools/front_end/timeline/LayerDetailsView.js
+++ b/Source/devtools/front_end/timeline/LayerDetailsView.js
@@ -84,7 +84,8 @@ WebInspector.LayerDetailsView.CompositingReasonDetail = {
     "layerForForeground": WebInspector.UIString("Layer for foreground."),
     "layerForBackground": WebInspector.UIString("Layer for background."),
     "layerForMask": WebInspector.UIString("Layer for mask."),
-    "layerForVideoOverlay": WebInspector.UIString("Layer for video overlay.")
+    "layerForVideoOverlay": WebInspector.UIString("Layer for video overlay."),
+    "scrollBlocksOn": WebInspector.UIString("Composition due to association with an element with a CSS \"scroll-blocks-on\" property applied."),
 };
 
 WebInspector.LayerDetailsView.prototype = {