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

chrome/browser/views/app_launcher.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_VIEWS_APP_LAUNCHER_H_
 #define CHROME_BROWSER_VIEWS_APP_LAUNCHER_H_
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/tab_contents/tab_contents_delegate.h"
 #include "chrome/browser/views/pinned_contents_info_bubble.h"
@@ skipping 79 matching lines @@
                               const gfx::Rect& initial_pos,
                               bool user_gesture);
   virtual void ActivateContents(TabContents* contents) {}
   virtual void LoadingStateChanged(TabContents* source) {}
   virtual void CloseContents(TabContents* source) {}
   virtual void MoveContents(TabContents* source, const gfx::Rect& pos) {}
   virtual bool IsPopup(TabContents* source) { return false; }
   virtual void ToolbarSizeChanged(TabContents* source, bool is_animating) {}
   virtual void URLStarredChanged(TabContents* source, bool starred) {}
   virtual void UpdateTargetURL(TabContents* source, const GURL& url) {}
+  virtual bool ShouldEnablePreferredSizeNotifications() { return true; }
   virtual void UpdatePreferredSize(const gfx::Size& pref_size);
 
  private:
   friend class DeleteTask<AppLauncher>;
   friend class NavigationBar;
   friend class InfoBubbleContentsView;
 
   explicit AppLauncher(Browser* browser);
   ~AppLauncher();
 
   void AddTabWithURL(const GURL& url, PageTransition::Type transition);
 
   // The currently active browser. We use this to open urls.
   Browser* browser_;
 
   // The InfoBubble displaying the Omnibox and app contents.
   PinnedContentsInfoBubble* info_bubble_;
 
   // The view with the navigation bar and render view, shown in the info-bubble.
   InfoBubbleContentsView* info_bubble_content_;
 
   // An optional string containing querystring-encoded name/value pairs to be
   // sent into the launcher's HTML page via its hash.
   std::string hash_params_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLauncher);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_APP_LAUNCHER_H_