Makes copying layers clone external textures.

ui/aura/window.cc

 // Copyright (c) 2012 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 "ui/aura/window.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 149 matching lines @@
   Env::GetInstance()->NotifyWindowInitialized(this);
 }
 
 ui::Layer* Window::RecreateLayer() {
   // Disconnect the old layer, but don't delete it.
   ui::Layer* old_layer = AcquireLayer();
   if (!old_layer)
     return NULL;
 
   old_layer->set_delegate(NULL);
+  if (delegate_ && old_layer->external_texture())
+    old_layer->SetExternalTexture(delegate_->CopyTexture());

[piman, 2012/09/14 02:27:17]

I just realized, the ui::Texture doesn't take ownership of the texture ID, so
this will leak the texture.

   layer_ = new ui::Layer(old_layer->type());
   layer_owner_.reset(layer_);
   layer_->SetVisible(old_layer->visible());
   layer_->set_scale_content(old_layer->scale_content());
   layer_->set_delegate(this);
   UpdateLayerName(name_);
   layer_->SetFillsBoundsOpaquely(!transparent_);
   // Install new layer as a sibling of the old layer, stacked on top of it.
   if (old_layer->parent()) {
     old_layer->parent()->Add(layer_);
@@ skipping 787 matching lines @@
   bool contains_mouse = false;
   if (IsVisible()) {
     RootWindow* root_window = GetRootWindow();
     contains_mouse = root_window &&
         ContainsPointInRoot(root_window->GetLastMouseLocationInRoot());
   }
   return contains_mouse;
 }
 
 }  // namespace aura