Makes copying layers clone external textures.

content/browser/web_contents/web_contents_view_aura.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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/web_contents/interstitial_page_impl.h"
@@ skipping 529 matching lines @@
     web_contents_->WasHidden();
 }
 
 bool WebContentsViewAura::HasHitTestMask() const {
   return false;
 }
 
 void WebContentsViewAura::GetHitTestMask(gfx::Path* mask) const {
 }
 
+scoped_refptr<ui::Texture> WebContentsViewAura::CopyTexture() {
+  // The layer we create doesn't have an external texture, so this should never
+  // get invoked.
+  NOTREACHED();
+  return scoped_refptr<ui::Texture>();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, ui::EventHandler implementation:
 
 ui::EventResult WebContentsViewAura::OnKeyEvent(ui::KeyEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
 ui::EventResult WebContentsViewAura::OnMouseEvent(ui::MouseEvent* event) {
   if (!web_contents_->GetDelegate())
     return ui::ER_UNHANDLED;
@@ skipping 77 matching lines @@
     OnDragEntered(event);
 
   web_contents_->GetRenderViewHost()->DragTargetDrop(
       event.location(),
       gfx::Screen::GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   return current_drag_op_;
 }