Makes the current page dim out when transitioning to instant preview.

chrome/browser/gtk/browser_window_gtk.cc

 // 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/gtk/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <string>
 
@@ skipping 1109 matching lines @@
 }
 
 void BrowserWindowGtk::Copy() {
   DoCutCopyPaste(this, &RenderViewHost::Copy, "copy-clipboard");
 }
 
 void BrowserWindowGtk::Paste() {
   DoCutCopyPaste(this, &RenderViewHost::Paste, "paste-clipboard");
 }
 
+void BrowserWindowGtk::PrepareForInstant() {
+  // TODO: implement fade as done on windows.
+}
+
 void BrowserWindowGtk::ShowInstant(TabContents* preview_contents) {
   contents_container_->SetPreviewContents(preview_contents);
 }
 
 void BrowserWindowGtk::HideInstant() {
   contents_container_->PopPreviewContents();
 }
 
 gfx::Rect BrowserWindowGtk::GetInstantBounds() {
   return gtk_util::GetWidgetScreenBounds(contents_container_->widget());
@@ skipping 1118 matching lines @@
   // special-case the ones where the custom frame should be used.  These names
   // are taken from the WMs' source code.
   return (wm_name == "Blackbox" ||
           wm_name == "compiz" ||
           wm_name == "e16" ||  // Enlightenment DR16
           wm_name == "Metacity" ||
           wm_name == "Mutter" ||
           wm_name == "Openbox" ||
           wm_name == "Xfwm4");
 }