Create render view for extensions on Linux.

chrome/browser/gtk/extension_shelf_gtk.cc

 // Copyright (c) 2009 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/gtk/extension_shelf_gtk.h"
 
 #include "chrome/browser/browser.h"
 #include "chrome/browser/gtk/browser_window_gtk.h"
 #include "chrome/browser/gtk/gtk_theme_provider.h"
 #include "chrome/browser/gtk/nine_box.h"
 #include "chrome/browser/profile.h"
 #include "chrome/common/notification_service.h"
 #include "grit/app_resources.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 
 // Preferred height of the ExtensionShelfGtk.
 static const int kShelfHeight = 29;
 
 static const int kToolstripPadding = 2;
 
 class ExtensionShelfGtk::Toolstrip {
  public:
   explicit Toolstrip(ExtensionHost* host)
       : host_(host),
         extension_name_(host_->extension()->name()) {
+    DCHECK(host_->view());
     Init();
   }
 
   ~Toolstrip() {
     label_.Destroy();
   }
 
   void AddToolstripToBox(GtkWidget* box);
   void RemoveToolstripFromBox(GtkWidget* box);
 
@@ skipping 167 matching lines @@
                   event->area.width, event->area.height);
   cairo_clip(cr);
   bar->InitBackground();
   bar->background_ninebox_->RenderTopCenterStrip(
       cr, event->area.x, event->area.y,
       event->area.x + event->area.width);
   cairo_destroy(cr);
 
   return FALSE;  // Propagate expose to children.
 }