Added showing slow scroll rectangles in Layers panel.

LayoutTests/http/tests/inspector/layers-test.js

Index: LayoutTests/http/tests/inspector/layers-test.js
diff --git a/LayoutTests/http/tests/inspector/layers-test.js b/LayoutTests/http/tests/inspector/layers-test.js
index 6e019d7e1d9a2884200045236e0632c85e40c475..37e84717a10052264c915fcb74307451961f8a34 100644
--- a/LayoutTests/http/tests/inspector/layers-test.js
+++ b/LayoutTests/http/tests/inspector/layers-test.js
@@ -101,4 +101,27 @@ function initialize_LayerTreeTests()
             callback();
         }
     }
+
+    InspectorTest.dumpViewScrollRect = function(element)
+    {
+        // InspectorTest.addResult("scrollRect: " + JSON.stringify(element.__scrollRect));

[caseq, 2014/02/24 14:38:56]

please remove

[malch, 2014/02/25 10:36:40]

Done.

+        InspectorTest.addObject(element.__scrollRect, {layerId: "skip"}, "", "scrollRect: ");
+    }
+
+    InspectorTest.dumpViewScrollRects = function()
+    {
+        InspectorTest.addResult("View elements dump");
+        var root = WebInspector.panel("layers")._layers3DView._rotatingContainerElement;
+        var scrollRectElements = root.querySelectorAll('.scroll-rect');
+        for (var i = 0, element; element = scrollRectElements[i]; ++i) {

[caseq, 2014/02/24 14:38:56]

scrollRectElements.forEach()?

[malch, 2014/02/25 10:36:40]

https://coderwall.com/p/jcmzxw

+            InspectorTest.dumpViewScrollRect(element);
+        }
+    }
+
+    InspectorTest.dumpModelScrollRects = function()
+    {
+        InspectorTest.addResult("Model elements dump");
+        // InspectorTest.addResult("scrollRectsByLayerId: " + JSON.stringify(InspectorTest._layerTreeModel._scrollRectsByLayerId));

[caseq, 2014/02/24 14:38:56]

Please remove.

[malch, 2014/02/25 10:36:40]

Done.

+        InspectorTest.addObject(InspectorTest._layerTreeModel._scrollRectsByLayerId, {layerId: "skip"}, "", "scrollRectsByLayerId: ");
+    }
 }