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

chrome/browser/ui/views/tab_contents/tab_contents_container_native.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.
 
 #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.h"
 #include "chrome/common/notification_details.h"
 #include "chrome/common/notification_source.h"
 
-#if defined(TOUCH_UI)
-#include "chrome/browser/ui/views/tab_contents/native_tab_contents_container_gtk.h"
-#include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
-#include "views/border.h"
-#include "views/fill_layout.h"
-#endif
+// 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.
 
 ////////////////////////////////////////////////////////////////////////////////
 // TabContentsContainer, public:
 
 TabContentsContainer::TabContentsContainer()
     : native_container_(NULL),
       tab_contents_(NULL),
       reserved_area_delegate_(NULL) {
   SetID(VIEW_ID_TAB_CONTAINER);
 }
 
-TabContentsContainer::~TabContentsContainer() {
-  if (tab_contents_)
-    RemoveObservers();
-}
-
 void TabContentsContainer::ChangeTabContents(TabContents* contents) {
   if (tab_contents_) {
-#if !defined(TOUCH_UI)
     native_container_->DetachContents(tab_contents_);
-#else
-    views::View *v = static_cast<TabContentsViewViews*>(tab_contents_->view());
-    RemoveChildView(v);
-#endif
     tab_contents_->WasHidden();
     RemoveObservers();
   }
-#if !defined(TOUCH_UI)
   TabContents* old_contents = tab_contents_;
-#endif
   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_) {
-#if defined(TOUCH_UI)
-    views::View *v = static_cast<TabContentsViewViews*>(contents->view());
-    // Guard against re-adding ourselves, which happens because the NULL
-    // value is ignored by the pre-existing if() above.
-    if (v->GetParent() != this) {
-      AddChildView(v);
-      SetLayoutManager(new views::FillLayout());
-      Layout();
-    }
-#else
     RenderWidgetHostViewChanged(
         old_contents ? old_contents->GetRenderWidgetHostView() : NULL,
         tab_contents_->GetRenderWidgetHostView());
     native_container_->AttachContents(tab_contents_);
-#endif
     AddObservers();
   }
 }
 
 void TabContentsContainer::TabContentsFocused(TabContents* tab_contents) {
-  if (native_container_)
-    native_container_->TabContentsFocused(tab_contents);
+  native_container_->TabContentsFocused(tab_contents);
 }
 
 void TabContentsContainer::SetFastResize(bool fast_resize) {
-  if (native_container_)
-    native_container_->SetFastResize(fast_resize);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// TabContentsContainer, NotificationObserver implementation:
-
-void TabContentsContainer::Observe(NotificationType type,
-                                   const NotificationSource& source,
-                                   const NotificationDetails& details) {
-  if (type == NotificationType::RENDER_VIEW_HOST_CHANGED) {
-    RenderViewHostSwitchedDetails* switched_details =
-        Details<RenderViewHostSwitchedDetails>(details).ptr();
-    RenderViewHostChanged(switched_details->old_host,
-                          switched_details->new_host);
-  } else if (type == NotificationType::TAB_CONTENTS_DESTROYED) {
-    TabContentsDestroyed(Source<TabContents>(source).ptr());
-  } else {
-    NOTREACHED();
-  }
+  native_container_->SetFastResize(fast_resize);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // TabContentsContainer, View overrides:
 
 void TabContentsContainer::Layout() {
-#if defined(TOUCH_UI)
-  views::View::Layout();
-#else
-  if (native_container_) {

[sky, 2011/01/12 19:06:53]

You need this if.

[Alex Nicolaou, 2011/01/13 15:56:29]

Oh :( You're right, this pre-exists my previous change. I had added a lot of if
(native_container_) tests in the version where everything was all in one file
and I thought this was one of mine. I did a git blame on the file and verified
that this was the only test that I removed that I shouldn't have. 

-    if (reserved_area_delegate_)
-      reserved_area_delegate_->UpdateReservedContentsRect(this);
-    native_container_->GetView()->SetBounds(0, 0, width(), height());
-    native_container_->GetView()->Layout();
-  }
-#endif
-}
-
-AccessibilityTypes::Role TabContentsContainer::GetAccessibleRole() {
-  return AccessibilityTypes::ROLE_WINDOW;
+  if (reserved_area_delegate_)
+    reserved_area_delegate_->UpdateReservedContentsRect(this);
+  native_container_->GetView()->SetBounds(0, 0, width(), height());
+  native_container_->GetView()->Layout();
 }
 
 void TabContentsContainer::ViewHierarchyChanged(bool is_add,
                                                 views::View* parent,
                                                 views::View* child) {
-#if defined(TOUCH_UI)
-  views::View::ViewHierarchyChanged(is_add, parent, child);
-#else
   if (is_add && child == this) {
     native_container_ = NativeTabContentsContainer::CreateNativeContainer(this);
     AddChildView(native_container_->GetView());
   }
-#endif
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // TabContentsContainer, private:
 
-void TabContentsContainer::AddObservers() {
-  // TabContents can change their RenderViewHost and hence the HWND that is
-  // shown and getting focused.  We need to keep track of that so we install
-  // the focus subclass on the shown HWND so we intercept focus change events.
-  registrar_.Add(this,
-                 NotificationType::RENDER_VIEW_HOST_CHANGED,
-                 Source<NavigationController>(&tab_contents_->controller()));
-
-  registrar_.Add(this,
-                 NotificationType::TAB_CONTENTS_DESTROYED,
-                 Source<TabContents>(tab_contents_));
-}
-
-void TabContentsContainer::RemoveObservers() {
-  registrar_.RemoveAll();
-}
-
 void TabContentsContainer::RenderViewHostChanged(RenderViewHost* old_host,
                                                  RenderViewHost* new_host) {
-#if defined(TOUCH_UI)
-  NOTIMPLEMENTED();  // TODO(anicolao)
-#else
   if (new_host) {
     RenderWidgetHostViewChanged(
         old_host ? old_host->view() : NULL, new_host->view());
   }
   native_container_->RenderViewHostChanged(old_host, new_host);
-#endif
 }
-
-void TabContentsContainer::TabContentsDestroyed(TabContents* contents) {
-  // Sometimes, a TabContents is destroyed before we know about it. This allows
-  // us to clean up our state in case this happens.
-  DCHECK(contents == tab_contents_);
-  ChangeTabContents(NULL);
-}
-
-void TabContentsContainer::RenderWidgetHostViewChanged(
-    RenderWidgetHostView* old_view, RenderWidgetHostView* new_view) {
-  // Carry over the reserved rect, if possible.
-  if (old_view && new_view) {
-    new_view->set_reserved_contents_rect(old_view->reserved_contents_rect());
-  } else {
-    if (reserved_area_delegate_)
-      reserved_area_delegate_->UpdateReservedContentsRect(this);
-  }
-}