Bunch of match preview tweaks:

chrome/browser/views/frame/contents_container.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_FRAME_CONTENTS_CONTAINER_H_
+#define CHROME_BROWSER_VIEWS_FRAME_CONTENTS_CONTAINER_H_
+#pragma once
+
+#include "views/view.h"
+
+class BrowserView;
+class TabContents;
+
+namespace views {
+class Widget;
+}
+
+// ContentsContainer is responsible for managing the TabContents views.
+// ContentsContainer has up to two children: one for the currently active
+// TabContents and one for the match preview TabContents.
+class ContentsContainer : public views::View {
+ public:
+  ContentsContainer(BrowserView* browser_view, views::View* active);
+  virtual ~ContentsContainer();
+
+  // Makes the preview view the active view and nulls out the old active view.
+  // It's assumed the caller will delete or remove the old active view
+  // separately.
+  void MakePreviewContentsActiveContents();
+
+  // Sets the preview view. This does not delete the old.
+  void SetPreview(views::View* preview, TabContents* preview_tab_contents);
+
+  TabContents* preview_tab_contents() const { return preview_tab_contents_; }
+
+  // Sets the active top margin.
+  void SetActiveTopMargin(int margin);
+
+  // View overrides:
+  virtual void Layout();
+
+ private:
+#if defined(OS_WIN)
+  class TearWindow;
+#else
+  typedef views::Widget TearWindow;
+#endif
+
+  // Creates and configures the tear window.
+  void CreateTearWindow();
+
+  // Creates and returns a new TearWindow.
+  TearWindow* CreateTearWindowImpl();
+
+  // Resets the bounds of the tear window.
+  void PositionTearWindow();
+
+  // Closes and deletes the tear window.
+  void DeleteTearWindow();
+
+  // Invoked when the tear window is destroyed.
+  void TearWindowDestroyed();
+
+  BrowserView* browser_view_;
+
+  views::View* active_;
+
+  views::View* preview_;
+
+  TabContents* preview_tab_contents_;
+
+  // Window used to show the page tear.
+  TearWindow* tear_window_;
+
+  // The margin between the top and the active view. This is used to make the
+  // preview overlap the bookmark bar on the new tab page.
+  int active_top_margin_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentsContainer);
+};
+
+#endif  // CHROME_BROWSER_VIEWS_FRAME_CONTENTS_CONTAINER_H_