Initial scroll-blocks-on compositor integration

Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp

Index: Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp
diff --git a/Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp b/Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp
index 588ad1e1e0c9b883bf2132b31a1cdb3378af0507..7e138b5f457f8f35ee454c1a92da7ec509cd0731 100644
--- a/Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp
+++ b/Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp
@@ -190,7 +190,7 @@ void CompositingRequirementsUpdater::update(RenderLayer* root)
     TRACE_EVENT0("blink", "CompositingRequirementsUpdater::updateRecursive");
 
     // Go through the layers in presentation order, so that we can compute which RenderLayers need compositing layers.
-    // FIXME: we could maybe do this and the hierarchy udpate in one pass, but the parenting logic would be more complex.
+    // FIXME: we could maybe do this and the hierarchy update in one pass, but the parenting logic would be more complex.
     RecursionData recursionData(root);
     OverlapMap overlapTestRequestMap;
     bool saw3DTransform = false;