First stab at touch optimized omnibox auto-complete per sgabriel's mocks.

chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h

Index: chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h
diff --git a/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h b/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h
index ffd2f01cc806dca6a13ec3fddf0aacd306df260c..78c1ea40a3d3180e21715656da14ec47b2cfab59 100644
--- a/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h
+++ b/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h
@@ -32,12 +32,23 @@ class AutocompletePopupContentsView : public views::View,
                                       public AutocompletePopupView,
                                       public ui::AnimationDelegate {
  public:
+  // Creates the appropriate type of omnibox dropdown for the
+  // current environment, e.g. desktop vs. touch optimized layout.
+  static AutocompletePopupContentsView* CreateForEnvironment(
+      const gfx::Font& font,
+      OmniboxView* omnibox_view,
+      AutocompleteEditModel* edit_model,
+      views::View* location_bar);
+
   AutocompletePopupContentsView(const gfx::Font& font,
                                 OmniboxView* omnibox_view,
                                 AutocompleteEditModel* edit_model,
                                 views::View* location_bar);
   virtual ~AutocompletePopupContentsView();
 
+  // Call immediately after construction.
+  void Init();
+
   // Returns the bounds the popup should be shown at. This is the display bounds
   // and includes offsets for the dropshadow which this view's border renders.
   gfx::Rect GetPopupBounds() const;