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..e05f29fabbf172f691a1bd4c4b9acaad2b9d8eb8 100644
--- a/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h
+++ b/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.h
@@ -32,11 +32,13 @@ class AutocompletePopupContentsView : public views::View,
                                       public AutocompletePopupView,
                                       public ui::AnimationDelegate {
  public:
-  AutocompletePopupContentsView(const gfx::Font& font,
-                                OmniboxView* omnibox_view,
-                                AutocompleteEditModel* edit_model,
-                                views::View* location_bar);
-  virtual ~AutocompletePopupContentsView();
+  // 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);
 
   // 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.
@@ -73,6 +75,12 @@ class AutocompletePopupContentsView : public views::View,
   virtual void OnMouseExited(const views::MouseEvent& event) OVERRIDE;
 
  protected:
+  AutocompletePopupContentsView(const gfx::Font& font,
+                                OmniboxView* omnibox_view,
+                                AutocompleteEditModel* edit_model,
+                                views::View* location_bar);
+  virtual ~AutocompletePopupContentsView();
+
   virtual void PaintResultViews(gfx::Canvas* canvas);
 
   // Calculates the height needed to show all the results in the model.
@@ -96,6 +104,9 @@ class AutocompletePopupContentsView : public views::View,
  private:
   class AutocompletePopupWidget;
 
+  // Call immediately after construction.
+  void Init();
+
   // Returns true if the model has a match at the specified index.
   bool HasMatchAt(size_t index) const;