Nukes the nano tab style on gtk and brings back the toolbar for apps

on gtk. This is a revert of most of r52070and 51478. I've kept parts
of these changes we want in though: comments, nuking nano tab gap on
views, having app tabs use a bigger icon.

BUG=49013
TEST=none

Review URL: http://codereview.chromium.org/3011007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@52830 0039d316-1c4b-4281-b951-d872f2087c98

12 files changed, 38 insertions, 147 deletions

diff --git a/chrome/browser/gtk/bookmark_bar_gtk.cc b/chrome/browser/gtk/bookmark_bar_gtk.cc
index cce885e..7f9f978 100644
--- a/chrome/browser/gtk/bookmark_bar_gtk.cc
+++ b/chrome/browser/gtk/bookmark_bar_gtk.cc
@@ -400,11 +400,6 @@ bool BookmarkBarGtk::OnNewTabPage() {
           browser_->GetSelectedTabContents()->ShouldShowBookmarkBar());
 }
 
-bool BookmarkBarGtk::OnAppsPage() const {
-  return (browser_ && browser_->GetSelectedTabContents() &&
-          browser_->GetSelectedTabContents()->is_app());
-}
-
 void BookmarkBarGtk::Loaded(BookmarkModel* model) {
   // If |instructions_| has been nulled, we are in the middle of browser
   // shutdown. Do nothing.
diff --git a/chrome/browser/gtk/bookmark_bar_gtk.h b/chrome/browser/gtk/bookmark_bar_gtk.h
index a70b361..b00d61a 100644
--- a/chrome/browser/gtk/bookmark_bar_gtk.h
+++ b/chrome/browser/gtk/bookmark_bar_gtk.h
@@ -77,9 +77,6 @@ class BookmarkBarGtk : public AnimationDelegate,
   // rendering).
   bool OnNewTabPage();
 
-  // True if we're on an extension apps page.
-  bool OnAppsPage() const;
-
   // Change the visibility of the bookmarks bar. (Starts out hidden, per GTK's
   // default behaviour). There are three visiblity states:
   //
diff --git a/chrome/browser/gtk/browser_toolbar_gtk.cc b/chrome/browser/gtk/browser_toolbar_gtk.cc
index b45d4c5c..ebebf4d 100644
--- a/chrome/browser/gtk/browser_toolbar_gtk.cc
+++ b/chrome/browser/gtk/browser_toolbar_gtk.cc
@@ -95,8 +95,7 @@ BrowserToolbarGtk::BrowserToolbarGtk(Browser* browser, BrowserWindowGtk* window)
       profile_(NULL),
       menu_bar_helper_(this),
       upgrade_reminder_animation_(this),
-      upgrade_reminder_canceled_(false),
-      collapsed_(false) {
+      upgrade_reminder_canceled_(false) {
   browser_->command_updater()->AddCommandObserver(IDC_BACK, this);
   browser_->command_updater()->AddCommandObserver(IDC_FORWARD, this);
   browser_->command_updater()->AddCommandObserver(IDC_HOME, this);
@@ -293,14 +292,6 @@ LocationBar* BrowserToolbarGtk::GetLocationBar() const {
   return location_bar_.get();
 }
 
-void BrowserToolbarGtk::set_collapsed(bool val) {
-  collapsed_ = val;
-  if (collapsed_)
-    Hide();
-  else
-    Show();
-}
-
 void BrowserToolbarGtk::UpdateForBookmarkBarVisibility(
     bool show_bottom_padding) {
   gtk_alignment_set_padding(GTK_ALIGNMENT(alignment_),
diff --git a/chrome/browser/gtk/browser_toolbar_gtk.h b/chrome/browser/gtk/browser_toolbar_gtk.h
index 20860de9..b1a6da3 100644
--- a/chrome/browser/gtk/browser_toolbar_gtk.h
+++ b/chrome/browser/gtk/browser_toolbar_gtk.h
@@ -83,9 +83,6 @@ class BrowserToolbarGtk : public CommandUpdater::CommandObserver,
 
   LocationBarViewGtk* GetLocationBarView() { return location_bar_.get(); }
 
-  bool collapsed() const { return collapsed_; }
-  void set_collapsed(bool val);
-
   // We have to show padding on the bottom of the toolbar when the bookmark
   // is in floating mode. Otherwise the bookmark bar will paint it for us.
   void UpdateForBookmarkBarVisibility(bool show_bottom_padding);
@@ -281,9 +278,6 @@ class BrowserToolbarGtk : public CommandUpdater::CommandObserver,
   // We have already shown and dismissed the upgrade reminder animation.
   bool upgrade_reminder_canceled_;
 
-  // When collapsed, the toolbar is just a tiny strip, no controls are visible.
-  bool collapsed_;
-
   DISALLOW_COPY_AND_ASSIGN(BrowserToolbarGtk);
 };
 
diff --git a/chrome/browser/gtk/browser_window_gtk.cc b/chrome/browser/gtk/browser_window_gtk.cc
index d5a1691..839c61b 100644
--- a/chrome/browser/gtk/browser_window_gtk.cc
+++ b/chrome/browser/gtk/browser_window_gtk.cc
@@ -863,7 +863,8 @@ void BrowserWindowGtk::RotatePaneFocus(bool forwards) {
 }
 
 bool BrowserWindowGtk::IsBookmarkBarVisible() const {
-  return IsBookmarkBarSupported() && bookmark_bar_.get() &&
+  return browser_->SupportsWindowFeature(Browser::FEATURE_BOOKMARKBAR) &&
+      bookmark_bar_.get() &&
       browser_->profile()->GetPrefs()->GetBoolean(prefs::kShowBookmarkBar);
 }
 
@@ -1113,10 +1114,6 @@ void BrowserWindowGtk::Paste() {
   DoCutCopyPaste(this, &RenderViewHost::Paste, "paste-clipboard");
 }
 
-void BrowserWindowGtk::SetToolbarCollapsedMode(bool val) {
-  toolbar_->set_collapsed(val);
-}
-
 void BrowserWindowGtk::ConfirmBrowserCloseWithPendingDownloads() {
   new DownloadInProgressDialogGtk(browser());
 }
@@ -1218,17 +1215,12 @@ void BrowserWindowGtk::ActiveWindowChanged(GdkWindow* active_window) {
 
 void BrowserWindowGtk::MaybeShowBookmarkBar(TabContents* contents,
                                             bool animate) {
-  if (!IsBookmarkBarSupported()) {
-    // Because the bookmark bar is never shown in app tab windows, we must
-    // explicitly hide to handle the case of switching tabs.
-    if (bookmark_bar_.get())
-      bookmark_bar_->Hide(false);  // animate
+  if (!IsBookmarkBarSupported())
     return;
-  }
 
   bool show_bar = false;
 
-  if (contents) {
+  if (IsBookmarkBarSupported() && contents) {
     bookmark_bar_->SetProfile(contents->profile());
     bookmark_bar_->SetPageNavigator(contents);
     show_bar = true;
@@ -2040,16 +2032,11 @@ bool BrowserWindowGtk::IsTabStripSupported() const {
 }
 
 bool BrowserWindowGtk::IsToolbarSupported() const {
-  return !toolbar_->collapsed() &&
-         (browser_->SupportsWindowFeature(Browser::FEATURE_TOOLBAR) ||
-             browser_->SupportsWindowFeature(Browser::FEATURE_LOCATIONBAR));
+  return browser_->SupportsWindowFeature(Browser::FEATURE_TOOLBAR) ||
+         browser_->SupportsWindowFeature(Browser::FEATURE_LOCATIONBAR);
 }
 
 bool BrowserWindowGtk::IsBookmarkBarSupported() const {
-  // We never show the bookmark bar on app tab pages.
-  if (bookmark_bar_.get() && bookmark_bar_->OnAppsPage())
-    return false;
-
   return browser_->SupportsWindowFeature(Browser::FEATURE_BOOKMARKBAR);
 }
 
diff --git a/chrome/browser/gtk/browser_window_gtk.h b/chrome/browser/gtk/browser_window_gtk.h
index b672c89..f0c7af5 100644
--- a/chrome/browser/gtk/browser_window_gtk.h
+++ b/chrome/browser/gtk/browser_window_gtk.h
@@ -124,7 +124,7 @@ class BrowserWindowGtk : public BrowserWindow,
   virtual void Copy();
   virtual void Paste();
   virtual void ToggleTabStripMode() {}
-  virtual void SetToolbarCollapsedMode(bool val);
+  virtual void SetToolbarCollapsedMode(bool val) {}
 
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
diff --git a/chrome/browser/gtk/tabs/tab_gtk.cc b/chrome/browser/gtk/tabs/tab_gtk.cc
index 33a8b75..7383a5e 100644
--- a/chrome/browser/gtk/tabs/tab_gtk.cc
+++ b/chrome/browser/gtk/tabs/tab_gtk.cc
@@ -38,9 +38,7 @@ class TabGtk::ContextMenuController : public menus::SimpleMenuModel::Delegate {
  public:
   explicit ContextMenuController(TabGtk* tab)
       : tab_(tab),
-        model_(this, tab->delegate()->IsTabPinned(tab),
-            tab->delegate()->IsAppTab(tab),
-            tab->delegate()->IsToolbarVisible(tab)) {
+        model_(this, tab->delegate()->IsTabPinned(tab), false, true) {
     menu_.reset(new MenuGtk(NULL, &model_));
   }
 
diff --git a/chrome/browser/gtk/tabs/tab_gtk.h b/chrome/browser/gtk/tabs/tab_gtk.h
index 7f0e3fc..6630780 100644
--- a/chrome/browser/gtk/tabs/tab_gtk.h
+++ b/chrome/browser/gtk/tabs/tab_gtk.h
@@ -32,15 +32,9 @@ class TabGtk : public TabRendererGtk,
     // Returns true if the specified Tab is pinned.
     virtual bool IsTabPinned(const TabGtk* tab) const = 0;
 
-    // Returns true if the specified Tab contains an app.
-    virtual bool IsAppTab(const TabGtk* tab) const = 0;
-
     // Returns true if the specified Tab is detached.
     virtual bool IsTabDetached(const TabGtk* tab) const = 0;
 
-    // Returns true if the toolbar is visible for |tab|.
-    virtual bool IsToolbarVisible(const TabGtk* tab) const = 0;
-
     // Selects the specified Tab.
     virtual void SelectTab(TabGtk* tab) = 0;
 
diff --git a/chrome/browser/gtk/tabs/tab_renderer_gtk.cc b/chrome/browser/gtk/tabs/tab_renderer_gtk.cc
index cc6ea8f..0ae3023 100644
--- a/chrome/browser/gtk/tabs/tab_renderer_gtk.cc
+++ b/chrome/browser/gtk/tabs/tab_renderer_gtk.cc
@@ -128,11 +128,8 @@ TabRendererGtk::LoadingAnimation::Data::Data(
 
 bool TabRendererGtk::initialized_ = false;
 TabRendererGtk::TabImage TabRendererGtk::tab_active_ = {0};
-TabRendererGtk::TabImage TabRendererGtk::tab_active_nano_ = {0};
 TabRendererGtk::TabImage TabRendererGtk::tab_inactive_ = {0};
-TabRendererGtk::TabImage TabRendererGtk::tab_inactive_nano_ = {0};
 TabRendererGtk::TabImage TabRendererGtk::tab_alpha_ = {0};
-TabRendererGtk::TabImage TabRendererGtk::tab_alpha_nano_ = {0};
 gfx::Font* TabRendererGtk::title_font_ = NULL;
 int TabRendererGtk::title_font_height_ = 0;
 int TabRendererGtk::close_button_width_ = 0;
@@ -391,18 +388,11 @@ void TabRendererGtk::PaintFavIconArea(GdkEventExpose* event) {
     if (!theme_provider_->HasCustomImage(theme_id))
       offset_y = background_offset_y_;
   }
-
-  // If the tab is a nanotab, we must take care to only draw the background
-  // within the height of the nanotab.
-  int nanoTabOffset = data_.app ? 9 : 0;
   SkBitmap* tab_bg = theme_provider_->GetBitmapNamed(theme_id);
   canvas.TileImageInt(*tab_bg,
-                      x() + favicon_bounds_.x(),
-                      offset_y + favicon_bounds_.y() + nanoTabOffset,
-                      favicon_bounds_.x(),
-                      favicon_bounds_.y() + nanoTabOffset,
-                      favicon_bounds_.width(),
-                      favicon_bounds_.height() - nanoTabOffset);
+      x() + favicon_bounds_.x(), offset_y + favicon_bounds_.y(),
+      favicon_bounds_.x(), favicon_bounds_.y(),
+      favicon_bounds_.width(), favicon_bounds_.height());
 
   if (!IsSelected()) {
     double throb_value = GetThrobValue();
@@ -472,37 +462,18 @@ void TabRendererGtk::LoadTabImages() {
   tab_alpha_.image_l = rb.GetBitmapNamed(IDR_TAB_ALPHA_LEFT);
   tab_alpha_.image_r = rb.GetBitmapNamed(IDR_TAB_ALPHA_RIGHT);
 
-  tab_alpha_nano_.image_l = rb.GetBitmapNamed(IDR_TAB_ALPHA_NANO_LEFT);
-  tab_alpha_nano_.image_r = rb.GetBitmapNamed(IDR_TAB_ALPHA_NANO_RIGHT);
-
   tab_active_.image_l = rb.GetBitmapNamed(IDR_TAB_ACTIVE_LEFT);
   tab_active_.image_c = rb.GetBitmapNamed(IDR_TAB_ACTIVE_CENTER);
   tab_active_.image_r = rb.GetBitmapNamed(IDR_TAB_ACTIVE_RIGHT);
   tab_active_.l_width = tab_active_.image_l->width();
   tab_active_.r_width = tab_active_.image_r->width();
 
-  const int kNanoTabDiffHeight = 13;
-
-  tab_active_nano_.image_l = rb.GetBitmapNamed(IDR_TAB_ACTIVE_NANO_LEFT);
-  tab_active_nano_.image_c = rb.GetBitmapNamed(IDR_TAB_ACTIVE_NANO_CENTER);
-  tab_active_nano_.image_r = rb.GetBitmapNamed(IDR_TAB_ACTIVE_NANO_RIGHT);
-  tab_active_nano_.l_width = tab_active_nano_.image_l->width();
-  tab_active_nano_.r_width = tab_active_nano_.image_r->width();
-  tab_active_nano_.y_offset = kNanoTabDiffHeight;
-
   tab_inactive_.image_l = rb.GetBitmapNamed(IDR_TAB_INACTIVE_LEFT);
   tab_inactive_.image_c = rb.GetBitmapNamed(IDR_TAB_INACTIVE_CENTER);
   tab_inactive_.image_r = rb.GetBitmapNamed(IDR_TAB_INACTIVE_RIGHT);
   tab_inactive_.l_width = tab_inactive_.image_l->width();
   tab_inactive_.r_width = tab_inactive_.image_r->width();
 
-  tab_inactive_nano_.image_l = rb.GetBitmapNamed(IDR_TAB_INACTIVE_NANO_LEFT);
-  tab_inactive_nano_.image_c = rb.GetBitmapNamed(IDR_TAB_INACTIVE_NANO_CENTER);
-  tab_inactive_nano_.image_r = rb.GetBitmapNamed(IDR_TAB_INACTIVE_NANO_RIGHT);
-  tab_inactive_nano_.l_width = tab_inactive_.image_l->width();
-  tab_inactive_nano_.r_width = tab_inactive_.image_r->width();
-  tab_inactive_nano_.y_offset = kNanoTabDiffHeight;
-
   close_button_width_ = rb.GetBitmapNamed(IDR_TAB_CLOSE)->width();
   close_button_height_ = rb.GetBitmapNamed(IDR_TAB_CLOSE)->height();
 }
@@ -915,12 +886,6 @@ void TabRendererGtk::PaintInactiveTabBackground(gfx::Canvas* canvas) {
 
   SkBitmap* tab_bg = theme_provider_->GetBitmapNamed(tab_id);
 
-  // App tabs are drawn slightly differently (as nano tabs).
-  TabImage* tab_image = data_.app ? &tab_active_nano_ : &tab_active_;
-  TabImage* tab_inactive_image = data_.app ? &tab_inactive_nano_ :
-                                             &tab_inactive_;
-  TabImage* alpha = data_.app ? &tab_alpha_nano_ : &tab_alpha_;
-
   // If the theme is providing a custom background image, then its top edge
   // should be at the top of the tab. Otherwise, we assume that the background
   // image is a composited foreground + frame image.
@@ -928,35 +893,27 @@ void TabRendererGtk::PaintInactiveTabBackground(gfx::Canvas* canvas) {
       0 : background_offset_y_;
 
   // Draw left edge.
-  SkBitmap* theme_l = GetMaskedBitmap(alpha->image_l, tab_bg, offset_x,
+  SkBitmap* theme_l = GetMaskedBitmap(tab_alpha_.image_l, tab_bg, offset_x,
                                       offset_y);
   canvas->DrawBitmapInt(*theme_l, 0, 0);
 
   // Draw right edge.
-  SkBitmap* theme_r = GetMaskedBitmap(alpha->image_r, tab_bg,
-      offset_x + width() - tab_image->r_width, offset_y);
+  SkBitmap* theme_r = GetMaskedBitmap(tab_alpha_.image_r, tab_bg,
+      offset_x + width() - tab_active_.r_width, offset_y);
 
   canvas->DrawBitmapInt(*theme_r, width() - theme_r->width(), 0);
 
   // Draw center.
-  canvas->TileImageInt(
-      *tab_bg,
-      offset_x + tab_image->l_width,
-      kDropShadowOffset + offset_y + tab_image->y_offset,
-      tab_image->l_width,
-      kDropShadowHeight + tab_image->y_offset,
-      width() - tab_image->l_width - tab_image->r_width,
-      height() - kDropShadowHeight - tab_image->y_offset);
-
-  canvas->DrawBitmapInt(*tab_inactive_image->image_l, 0, 0);
-  canvas->TileImageInt(
-      *tab_inactive_image->image_c,
-      tab_inactive_image->l_width,
-      0,
-      width() - tab_inactive_image->l_width - tab_inactive_image->r_width,
-      height());
-  canvas->DrawBitmapInt(*tab_inactive_image->image_r,
-      width() - tab_inactive_image->r_width, 0);
+  canvas->TileImageInt(*tab_bg,
+      offset_x + tab_active_.l_width, kDropShadowOffset + offset_y,
+      tab_active_.l_width, 2,
+      width() - tab_active_.l_width - tab_active_.r_width, height() - 2);
+
+  canvas->DrawBitmapInt(*tab_inactive_.image_l, 0, 0);
+  canvas->TileImageInt(*tab_inactive_.image_c, tab_inactive_.l_width, 0,
+      width() - tab_inactive_.l_width - tab_inactive_.r_width, height());
+  canvas->DrawBitmapInt(*tab_inactive_.image_r,
+      width() - tab_inactive_.r_width, 0);
 }
 
 void TabRendererGtk::PaintActiveTabBackground(gfx::Canvas* canvas) {
@@ -964,32 +921,26 @@ void TabRendererGtk::PaintActiveTabBackground(gfx::Canvas* canvas) {
 
   SkBitmap* tab_bg = theme_provider_->GetBitmapNamed(IDR_THEME_TOOLBAR);
 
-  // App tabs are drawn slightly differently (as nano tabs).
-  TabImage* tab_image = data_.app ? &tab_active_nano_ : &tab_active_;
-  TabImage* alpha = data_.app ? &tab_alpha_nano_ : &tab_alpha_;
-
   // Draw left edge.
-  SkBitmap* theme_l = GetMaskedBitmap(alpha->image_l, tab_bg, offset_x, 0);
+  SkBitmap* theme_l = GetMaskedBitmap(tab_alpha_.image_l, tab_bg, offset_x, 0);
   canvas->DrawBitmapInt(*theme_l, 0, 0);
 
   // Draw right edge.
-  SkBitmap* theme_r = GetMaskedBitmap(alpha->image_r, tab_bg,
-      offset_x + width() - tab_image->r_width, 0);
-  canvas->DrawBitmapInt(*theme_r, width() - tab_image->r_width, 0);
+  SkBitmap* theme_r = GetMaskedBitmap(tab_alpha_.image_r, tab_bg,
+      offset_x + width() - tab_active_.r_width, 0);
+  canvas->DrawBitmapInt(*theme_r, width() - tab_active_.r_width, 0);
 
   // Draw center.
   canvas->TileImageInt(*tab_bg,
-                       offset_x + tab_image->l_width,
-                       kDropShadowHeight + tab_image->y_offset,
-                       tab_image->l_width,
-                       kDropShadowHeight + tab_image->y_offset,
-                       width() - tab_image->l_width - tab_image->r_width,
-                       height() - kDropShadowHeight - tab_image->y_offset);
-
-  canvas->DrawBitmapInt(*tab_image->image_l, 0, 0);
-  canvas->TileImageInt(*tab_image->image_c, tab_image->l_width, 0,
-      width() - tab_image->l_width - tab_image->r_width, height());
-  canvas->DrawBitmapInt(*tab_image->image_r, width() - tab_image->r_width, 0);
+      offset_x + tab_active_.l_width, kDropShadowHeight,
+      tab_active_.l_width, kDropShadowHeight,
+      width() - tab_active_.l_width - tab_active_.r_width,
+      height() - kDropShadowHeight);
+
+  canvas->DrawBitmapInt(*tab_active_.image_l, 0, 0);
+  canvas->TileImageInt(*tab_active_.image_c, tab_active_.l_width, 0,
+      width() - tab_active_.l_width - tab_active_.r_width, height());
+  canvas->DrawBitmapInt(*tab_active_.image_r, width() - tab_active_.r_width, 0);
 }
 
 void TabRendererGtk::PaintLoadingAnimation(gfx::Canvas* canvas) {
diff --git a/chrome/browser/gtk/tabs/tab_renderer_gtk.h b/chrome/browser/gtk/tabs/tab_renderer_gtk.h
index 4c168a7..1ba697d 100644
--- a/chrome/browser/gtk/tabs/tab_renderer_gtk.h
+++ b/chrome/browser/gtk/tabs/tab_renderer_gtk.h
@@ -384,11 +384,8 @@ class TabRendererGtk : public AnimationDelegate,
   TabData data_;
 
   static TabImage tab_active_;
-  static TabImage tab_active_nano_;
   static TabImage tab_inactive_;
-  static TabImage tab_inactive_nano_;
   static TabImage tab_alpha_;
-  static TabImage tab_alpha_nano_;
 
   static gfx::Font* title_font_;
   static int title_font_height_;
diff --git a/chrome/browser/gtk/tabs/tab_strip_gtk.cc b/chrome/browser/gtk/tabs/tab_strip_gtk.cc
index edce407..696896f8 100644
--- a/chrome/browser/gtk/tabs/tab_strip_gtk.cc
+++ b/chrome/browser/gtk/tabs/tab_strip_gtk.cc
@@ -1084,10 +1084,6 @@ bool TabStripGtk::IsTabDetached(const TabGtk* tab) const {
   return false;
 }
 
-bool TabStripGtk::IsToolbarVisible(const TabGtk* tab) const {
-  return model_->IsToolbarVisible(GetIndexOfTab(tab));
-}
-
 void TabStripGtk::GetCurrentTabWidths(double* unselected_width,
                                       double* selected_width) const {
   *unselected_width = current_unselected_width_;
@@ -1101,13 +1097,6 @@ bool TabStripGtk::IsTabPinned(const TabGtk* tab) const {
   return model_->IsTabPinned(GetIndexOfTab(tab));
 }
 
-bool TabStripGtk::IsAppTab(const TabGtk* tab) const {
-  if (tab->closing())
-    return false;
-
-  return model_->IsAppTab(GetIndexOfTab(tab));
-}
-
 void TabStripGtk::SelectTab(TabGtk* tab) {
   int index = GetIndexOfTab(tab);
   if (model_->ContainsIndex(index))
diff --git a/chrome/browser/gtk/tabs/tab_strip_gtk.h b/chrome/browser/gtk/tabs/tab_strip_gtk.h
index b0c3f3c..7fe8c60 100644
--- a/chrome/browser/gtk/tabs/tab_strip_gtk.h
+++ b/chrome/browser/gtk/tabs/tab_strip_gtk.h
@@ -121,9 +121,7 @@ class TabStripGtk : public TabStripModelObserver,
   // TabGtk::TabDelegate implementation:
   virtual bool IsTabSelected(const TabGtk* tab) const;
   virtual bool IsTabPinned(const TabGtk* tab) const;
-  virtual bool IsAppTab(const TabGtk* tab) const;
   virtual bool IsTabDetached(const TabGtk* tab) const;
-  virtual bool IsToolbarVisible(const TabGtk* tab) const;
   virtual void SelectTab(TabGtk* tab);
   virtual void CloseTab(TabGtk* tab);
   virtual bool IsCommandEnabledForTab(