Use a mocked compositor for unit tests

views/widget/native_widget_gtk.cc

 // Copyright (c) 2011 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 "views/widget/native_widget_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <X11/extensions/shape.h>
 #include <X11/Xatom.h>
@@ skipping 673 matching lines @@
   // Make container here.
   CreateGtkWidget(modified_params);
 
   if (params.type == Widget::InitParams::TYPE_MENU) {
     gtk_window_set_destroy_with_parent(GTK_WINDOW(GetNativeView()), TRUE);
     gtk_window_set_type_hint(GTK_WINDOW(GetNativeView()),
                              GDK_WINDOW_TYPE_HINT_MENU);
   }
 
   if (View::get_use_acceleration_when_possible()) {
-    if (Widget::compositor_factory()) {
-      compositor_ = (*Widget::compositor_factory())();
+    if (ui::Compositor::compositor_factory()) {
+      compositor_ = (*ui::Compositor::compositor_factory())(this);
     } else {
       gint width, height;
       gdk_drawable_get_size(window_contents_->window, &width, &height);
       compositor_ = ui::Compositor::Create(this,
           GDK_WINDOW_XID(window_contents_->window),
           gfx::Size(width, height));
     }
     if (compositor_.get()) {
       View* root_view = delegate_->AsWidget()->GetRootView();
       root_view->SetPaintToLayer(true);
@@ skipping 1600 matching lines @@
     button_pressed = event->type == GDK_BUTTON_PRESS ||
         event->type == GDK_2BUTTON_PRESS ||
         event->type == GDK_3BUTTON_PRESS;
     gdk_event_free(event);
   }
   return button_pressed;
 }
 
 }  // namespace internal
 }  // namespace views