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

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

 // Copyright (c) 2012 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_UI_VIEWS_AUTOCOMPLETE_AUTOCOMPLETE_POPUP_CONTENTS_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_AUTOCOMPLETE_AUTOCOMPLETE_POPUP_CONTENTS_VIEW_H_
 #pragma once
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
@@ skipping 14 matching lines @@
 namespace views {
 class BubbleBorder;
 }
 
 // A view representing the contents of the autocomplete popup.
 class AutocompletePopupContentsView : public views::View,
                                       public AutocompleteResultViewModel,
                                       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.
   gfx::Rect GetPopupBounds() const;
 
   virtual void LayoutChildren();
 
   // Overridden from AutocompletePopupView:
   virtual bool IsOpen() const OVERRIDE;
   virtual void InvalidateLine(size_t line) OVERRIDE;
@@ skipping 16 matching lines @@
       const gfx::Point& point) OVERRIDE;
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual void OnMouseMoved(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseEntered(const views::MouseEvent& event) OVERRIDE;
   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.
   virtual int CalculatePopupHeight();
   virtual AutocompleteResultView* CreateResultView(
       AutocompleteResultViewModel* model,
       int model_index,
       const gfx::Font& font,
       const gfx::Font& bold_font);
 
   // Overridden from views::View:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   // This method should not be triggered directly as we paint our children
   // in an un-conventional way inside OnPaint. We use a separate canvas to
   // paint the children. Hence we override this method to a no-op so that
   // the view hierarchy does not "accidentally" trigger this.
   virtual void PaintChildren(gfx::Canvas* canvas) OVERRIDE;
 
   scoped_ptr<AutocompletePopupModel> model_;
 
  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;
 
   // Returns the match at the specified index within the popup model.
   const AutocompleteMatch& GetMatchAtIndex(size_t index) const;
 
   // Fill a path for the contents' roundrect. |bounding_rect| is the rect that
   // bounds the path.
   void MakeContentsPath(gfx::Path* path, const gfx::Rect& bounding_rect);
 
@@ skipping 50 matching lines @@
   // The popup sizes vertically using an animation when the popup is getting
   // shorter (not larger, that makes it look "slow").
   ui::SlideAnimation size_animation_;
   gfx::Rect start_bounds_;
   gfx::Rect target_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompletePopupContentsView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AUTOCOMPLETE_AUTOCOMPLETE_POPUP_CONTENTS_VIEW_H_