layout-tests: Add flag for including compositingReasons in layerTreeAsText().

LayoutTests/fast/dom/CompositorProxy/proxy-forces-layer.html

Index: LayoutTests/fast/dom/CompositorProxy/proxy-forces-layer.html
diff --git a/LayoutTests/fast/dom/CompositorProxy/proxy-forces-layer.html b/LayoutTests/fast/dom/CompositorProxy/proxy-forces-layer.html
index 4ecbf97fc7f542c0eeca61f1f566935de83c4aeb..274950ecd86322fa2b7c6e3c50865544be5c5860 100644
--- a/LayoutTests/fast/dom/CompositorProxy/proxy-forces-layer.html
+++ b/LayoutTests/fast/dom/CompositorProxy/proxy-forces-layer.html
@@ -18,6 +18,7 @@ async_test(function(test) {
         docLayer = JSON.parse(window.internals.layerTreeAsText(document));
         assert_equals(1, docLayer.children.length);
         assert_equals(1, docLayer.children[0].children.length);
+        assert_not_equals(docLayer.children[0].children[0].compositingReasons.indexOf("compositorProxy"), -1);

[esprehn, 2015/05/25 21:05:43]

assert_true(...compositingReasons.includes("compositorProxy"))

[sadrul, 2015/05/25 21:08:45]

compositingReasons is actually an array, and there doesn't appear to be an
includes() there :-(

[esprehn, 2015/05/25 21:13:13]

Oh then you want to use assert_in_array then.

[sadrul, 2015/05/25 21:19:32]

Nice! Done. Thanks! (I looked for something like assert_contains)

 
         // Detach the element from the document. The corresponding layer should be removed.
         container.parentNode.removeChild(container);
@@ -30,6 +31,7 @@ async_test(function(test) {
         docLayer = JSON.parse(window.internals.layerTreeAsText(document));
         assert_equals(1, docLayer.children.length);
         assert_equals(1, docLayer.children[0].children.length);
+        assert_not_equals(docLayer.children[0].children[0].compositingReasons.indexOf("compositorProxy"), -1);
 
         // Disconnecting the proxy should also remove the layer.
         proxy.disconnect();