ui::Clipboard now uses base::win::MessageWindow to create a message-only window on Windows.

ui/base/clipboard/clipboard.h

 // 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.
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 13 matching lines @@
 
 #if defined(OS_WIN)
 #include <objidl.h>
 #elif defined(OS_ANDROID)
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #endif
 
-#if defined(USE_AURA) && defined(USE_X11)
+#if (defined(USE_AURA) && defined(USE_X11)) || defined(OS_WIN)
 #include "base/memory/scoped_ptr.h"
 #endif
 
 namespace base {
 class FilePath;
 }
 
 namespace gfx {
 class Size;
 }
@@ skipping 263 matching lines @@
                                      base::ProcessHandle process);
 #if defined(OS_WIN)
   // Firefox text/html
   static const FormatType& GetTextHtmlFormatType();
   static const FormatType& GetCFHDropFormatType();
   static const FormatType& GetFileDescriptorFormatType();
   static const FormatType& GetFileContentZeroFormatType();
 #endif
 
  private:
+  class ClipboardWindow;
+
   FRIEND_TEST_ALL_PREFIXES(ClipboardTest, SharedBitmapTest);
   FRIEND_TEST_ALL_PREFIXES(ClipboardTest, EmptyHTMLTest);
   friend class ClipboardTest;
 
   Clipboard();
   ~Clipboard();
 
   void DispatchObject(ObjectType type, const ObjectMapParams& params);
 
   void WriteText(const char* text_data, size_t text_len);
@@ skipping 29 matching lines @@
                                            std::string* url);
 
   // Free a handle depending on its type (as intuited from format)
   static void FreeData(unsigned int format, HANDLE data);
 
   // Return the window that should be the clipboard owner, creating it
   // if neccessary.  Marked const for lazily initialization by const methods.
   HWND GetClipboardWindow() const;
 
   // Mark this as mutable so const methods can still do lazy initialization.
-  mutable HWND clipboard_owner_;
+  mutable scoped_ptr<ClipboardWindow> clipboard_owner_;
 
-  // True if we can create a window.
-  bool create_window_;
 #elif defined(TOOLKIT_GTK)
   // The public API is via WriteObjects() which dispatches to multiple
   // Write*() calls, but on GTK we must write all the clipboard types
   // in a single GTK call.  To support this we store the current set
   // of data we intend to put on the clipboard on clipboard_data_ as
   // WriteObjects is running, and then at the end call SetGtkClipboard
   // which replaces whatever is on the system clipboard with the
   // contents of clipboard_data_.
 
  public:
@@ skipping 18 matching lines @@
   class AuraX11Details;
   scoped_ptr<AuraX11Details> aurax11_details_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Clipboard);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_H_