The app launcher had a height of zero as it was not getting preferred size up...

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
===================================================================
--- chrome/renderer/render_view.cc	(revision 46482)
+++ chrome/renderer/render_view.cc	(working copy)
@@ -3820,12 +3820,12 @@
 }
 
 void RenderView::OnEnablePreferredSizeChangedMode() {
-  DCHECK(!send_preferred_size_changes_);
+  if (send_preferred_size_changes_)
+    return;
+
   send_preferred_size_changes_ = true;
-
-  if (ViewType::ShouldAutoResize(view_type_))
-    preferred_size_change_timer_.Start(TimeDelta::FromMilliseconds(10), this,
-                                       &RenderView::CheckPreferredSize);
+  preferred_size_change_timer_.Start(TimeDelta::FromMilliseconds(10), this,

[Matt Perry, 2010/05/05 23:47:38]

I remember not liking this polling when it first went in. Aaron, what happened
to the webkit change that would remove the need for this?

+                                     &RenderView::CheckPreferredSize);
 }
 
 void RenderView::OnDisableScrollbarsForSmallWindows(