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 cb512a4274c835ec3dabf794e39245b7e0c04e98..5eece924e29f30a951bc64702eea5f6172341475 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -3854,6 +3854,19 @@
                 ]
             },
             {
+                "id": "ScrollRect",

[pfeldman, 2014/02/26 11:49:40]

Can ScrollRect contain Rect + type instead?

[malch, 2014/02/27 13:30:53]

Done.

+                "type": "object",
+                "description": "Rectangle that should be scrolled on main thread.",
+                "properties": [
+                    { "name": "x", "type": "number", "description": "Rectangle x coordinate." },
+                    { "name": "y", "type": "number", "description": "Rectangle y coordinate." },
+                    { "name": "width", "type": "number", "description": "Rectangle width." },
+                    { "name": "height", "type": "number", "description": "Rectangle height." },
+                    { "name": "layerId", "$ref": "LayerId", "description": "Parent layer id." },

[pfeldman, 2014/02/26 11:49:40]

Instead of this binding, could you make it a part of a layer?

[malch, 2014/02/27 13:30:53]

Done.

+                    { "name": "type", "type": "string", "enum": ["RepaintsOnScroll", "TouchEventHandler", "WheelEventHandler"], "description": "Reason for rectangle to be scrolled on the main thread" }
+                ]
+            },
+            {
                 "id": "PaintProfile",
                 "type": "array",
                 "description": "Array of timings, one per paint step.",
@@ -3927,7 +3940,8 @@
             {
                 "name": "layerTreeDidChange",
                 "parameters": [
-                    { "name": "layers", "type": "array", "items": { "$ref": "Layer" }, "optional": true, "description": "Layer tree, absent if not in the comspositing mode." }
+                    { "name": "layers", "type": "array", "items": { "$ref": "Layer" }, "optional": true, "description": "Layer tree, absent if not in the comspositing mode." },
+                    { "name": "scrollRects", "type": "array", "items": { "$ref": "ScrollRect" }, "optional": true, "description": "Rectangles scrolling on main thread only." }
                 ]
             },
             {