First cut at creating a refactored version of tab_contents_views. This is

chrome/browser/ui/views/tab_contents/tab_contents_container_views.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_UI_VIEWS_TAB_CONTENTS_TAB_CONTENTS_CONTAINER_H_
-#define CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_TAB_CONTENTS_CONTAINER_H_
-#pragma once
+#include "chrome/browser/ui/views/tab_contents/tab_contents_container.h"
 
+#include "chrome/browser/renderer_host/render_view_host.h"
+#include "chrome/browser/renderer_host/render_widget_host_view.h"
+#include "chrome/browser/tab_contents/interstitial_page.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/ui/view_ids.h"
+#include "chrome/browser/ui/views/tab_contents/native_tab_contents_container_gtk.h"
 #include "chrome/browser/ui/views/tab_contents/native_tab_contents_container.h"
-#include "chrome/common/notification_observer.h"
-#include "chrome/common/notification_registrar.h"
-#include "views/view.h"
+#include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
+#include "chrome/common/notification_details.h"
+#include "chrome/common/notification_source.h"
+#include "views/fill_layout.h"
 
-class NativeTabContentsContainer;
-class RenderViewHost;
-class RenderWidgetHostView;
-class TabContents;
+// Some of this class is implemented in tab_contents_container.cc, where
+// the implementation doesn't vary between a pure views approach and a
+// native view host approach. See the header file for details.
 
-class TabContentsContainer : public views::View,
-                             public NotificationObserver {
- public:
-  TabContentsContainer();
-  virtual ~TabContentsContainer();
+////////////////////////////////////////////////////////////////////////////////
+// TabContentsContainer, public:
 
-  // Changes the TabContents associated with this view.
-  void ChangeTabContents(TabContents* contents);
+TabContentsContainer::TabContentsContainer()
+    : tab_contents_(NULL) {
+  SetID(VIEW_ID_TAB_CONTAINER);
+}
 
-  View* GetFocusView() { return native_container_->GetView(); }
+void TabContentsContainer::ChangeTabContents(TabContents* contents) {
+  if (tab_contents_) {
+    views::View *v = static_cast<TabContentsViewViews*>(tab_contents_->view());
+    RemoveChildView(v);
+    tab_contents_->WasHidden();
+    RemoveObservers();
+  }
+  tab_contents_ = contents;
+  // When detaching the last tab of the browser ChangeTabContents is invoked
+  // with NULL. Don't attempt to do anything in that case.
+  if (tab_contents_) {
+    views::View *v = static_cast<TabContentsViewViews*>(contents->view());
+    AddChildView(v);
+    SetLayoutManager(new views::FillLayout());
+    Layout();
+    AddObservers();
+  }
+}
 
-  // Accessor for |tab_contents_|.
-  TabContents* tab_contents() const { return tab_contents_; }
+void TabContentsContainer::TabContentsFocused(TabContents* tab_contents) {
+}
 
-  // Called by the BrowserView to notify that |tab_contents| got the focus.
-  void TabContentsFocused(TabContents* tab_contents);
+void TabContentsContainer::SetFastResize(bool fast_resize) {
+}
 
-  // Tells the container to update less frequently during resizing operations
-  // so performance is better.
-  void SetFastResize(bool fast_resize);
-
-  // Updates the current reserved rect in view coordinates where contents
-  // should not be rendered to draw the resize corner, sidebar mini tabs etc.
-  void SetReservedContentsRect(const gfx::Rect& reserved_rect);
-
-  // Overridden from NotificationObserver:
-  virtual void Observe(NotificationType type,
-                       const NotificationSource& source,
-                       const NotificationDetails& details);
-
-  // Overridden from views::View:
-  virtual void Layout();
-  virtual AccessibilityTypes::Role GetAccessibleRole();
-
- protected:
-  // Overridden from views::View:
-  virtual void ViewHierarchyChanged(bool is_add, views::View* parent,
-                                    views::View* child);
-
- private:
-  // Add or remove observers for events that we care about.
-  void AddObservers();
-  void RemoveObservers();
-
-  // Called when the RenderViewHost of the hosted TabContents has changed, e.g.
-  // to show an interstitial page.
-  void RenderViewHostChanged(RenderViewHost* old_host,
-                             RenderViewHost* new_host);
-
-  // Called when a TabContents is destroyed. This gives us a chance to clean
-  // up our internal state if the TabContents is somehow destroyed before we
-  // get notified.
-  void TabContentsDestroyed(TabContents* contents);
-
-  // Called when the RenderWidgetHostView of the hosted TabContents has changed.
-  void RenderWidgetHostViewChanged(RenderWidgetHostView* new_view);
-
-  // An instance of a NativeTabContentsContainer object that holds the native
-  // view handle associated with the attached TabContents.
-  NativeTabContentsContainer* native_container_;
-
-  // The attached TabContents.
-  TabContents* tab_contents_;
-
-  // Handles registering for our notifications.
-  NotificationRegistrar registrar_;
-
-  // The current reserved rect in view coordinates where contents should not be
-  // rendered to draw the resize corner, sidebar mini tabs etc.
-  // Cached here to update ever changing renderers.
-  gfx::Rect cached_reserved_rect_;
-
-  DISALLOW_COPY_AND_ASSIGN(TabContentsContainer);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_TAB_CONTENTS_CONTAINER_H_
+void TabContentsContainer::RenderViewHostChanged(RenderViewHost* old_host,
+                                                 RenderViewHost* new_host) {
+  NOTIMPLEMENTED();  // TODO(anicolao)
+}