Added showing slow scroll rectangles in Layers panel.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 0e54f2b3da35b52a508ec9a0f4afe9fc43bd15f8..71cc4dcc951797ae42a314f0a6ffb191cdd362ff 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -3834,6 +3834,15 @@
                 "description": "Unique snapshot identifier."
             },
             {
+                "id": "ScrollRect",
+                "type": "object",
+                "description": "Rectangle that should be scrolled on main thread.",

[pfeldman, 2014/02/28 07:43:43]

Can you actually "scroll" a "rectangle"?

[malch, 2014/02/28 12:19:57]

Done.

+                "properties": [
+                    { "name": "rect", "$ref": "DOM.Rect", "description": "Rectangle itself." },
+                    { "name": "type", "type": "string", "enum": ["RepaintsOnScroll", "TouchEventHandler", "WheelEventHandler"], "description": "Reason for rectangle to be scrolled on the main thread" }
+                ]
+            },
+            {
                 "id": "Layer",
                 "type": "object",
                 "description": "Information about a compositing layer.",
@@ -3850,7 +3859,8 @@
                     { "name": "anchorY", "type": "number", "optional": true, "description": "Transform anchor point Y, absent if no transform specified" },
                     { "name": "anchorZ", "type": "number", "optional": true, "description": "Transform anchor point Z, absent if no transform specified" },
                     { "name": "paintCount", "type": "integer", "description": "Indicates how many time this layer has painted." },
-                    { "name": "invisible", "type": "boolean", "optional": true, "description": "Set if layer is not visible." }
+                    { "name": "invisible", "type": "boolean", "optional": true, "description": "Set if layer is not visible." },
+                    { "name": "scrollRects", "type": "array", "items": { "$ref": "ScrollRect"}, "optional": true, "description": "Rectangles scrolling on main thread only."}
                 ]
             },
             {