Multi-tab: Adding new Notification when tab selection changes.

chrome/browser/aeropeek_manager.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 "chrome/browser/aeropeek_manager.h"
 
 #include <dwmapi.h>
 #include <shobjidl.h>
 
 #include "app/win/shell.h"
@@ skipping 1097 matching lines @@
   // Chrome will call TabInsertedAt() when this tab is inserted to another
   // TabStrip. We will re-create an AeroPeekWindow object for this tab and
   // re-add it to the tab list there.
   DeleteAeroPeekWindowForTab(contents);
 }
 
 void AeroPeekManager::ActiveTabChanged(TabContentsWrapper* old_contents,
                                        TabContentsWrapper* new_contents,
                                        int index,
                                        bool user_gesture) {
-  if (old_contents == new_contents)
-    return;
-
   // Deactivate the old window in the thumbnail list and activate the new one
   // to synchronize the thumbnail list with TabStrip.
   if (old_contents) {
     AeroPeekWindow* old_window =
         GetAeroPeekWindow(GetTabID(old_contents->tab_contents()));
     if (old_window)
       old_window->Deactivate();
   }
 
   if (new_contents) {
@@ skipping 110 matching lines @@
   // This code is just copied from "thumbnail_generator.cc".
   skia::PlatformCanvas canvas;
   if (!backing_store->CopyFromBackingStore(gfx::Rect(backing_store->size()),
                                            &canvas))
     return false;
 
   const SkBitmap& bitmap = skia::GetTopDevice(canvas)->accessBitmap(false);
   bitmap.copyTo(preview, SkBitmap::kARGB_8888_Config);
   return true;
 }