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diff --git a/chrome/browser/printing/printer_query.h b/chrome/browser/printing/printer_query.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_BROWSER_PRINTING_PRINTER_QUERY_H__
+#define CHROME_BROWSER_PRINTING_PRINTER_QUERY_H__
+
+#include "base/ref_counted.h"
+#include "chrome/browser/printing/print_job_worker_owner.h"
+
+class CancelableTask;
+class MessageLoop;
+class Thread;
+
+namespace printing {
+
+class PrintJobWorker;
+
+// Query the printer for settings.
+class PrinterQuery : public base::RefCountedThreadSafe<PrinterQuery>,
+                     public PrintJobWorkerOwner {
+ public:
+  // GetSettings() UI parameter.
+  enum GetSettingsAskParam {
+    DEFAULTS,
+    ASK_USER,
+  };
+
+  PrinterQuery();
+  virtual ~PrinterQuery();
+
+  // PrintJobWorkerOwner
+  virtual void AddRef() {
+    return base::RefCountedThreadSafe<PrinterQuery>::AddRef();
+  }
+  virtual void Release() {
+    return base::RefCountedThreadSafe<PrinterQuery>::Release();
+  }
+  virtual void GetSettingsDone(const PrintSettings& new_settings,
+                               PrintingContext::Result result);
+  virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner);
+  virtual MessageLoop* message_loop() {
+    return ui_message_loop_;
+  }
+  virtual const PrintSettings& settings() const { return settings_; }
+
+  virtual int cookie() const { return cookie_; }
+
+  // Initializes the printing context. It is fine to call this function multiple
+  // times to reinitialize the settings. |parent_window| parameter will be the
+  // owner of the print setting dialog box. It is unused when
+  // |ask_for_user_settings| is DEFAULTS.
+  void GetSettings(GetSettingsAskParam ask_user_for_settings,
+                   HWND parent_window,
+                   int expected_page_count,
+                   CancelableTask* callback);
+
+  // Stops the worker thread since the client is done with this object.
+  void StopWorker();
+
+  // Returns true if the Print... dialog box is currently displayed.
+  bool is_print_dialog_box_shown() const;
+
+  // Returns true if a GetSettings() call is pending completion.
+  bool is_callback_pending() const;
+
+  PrintingContext::Result last_status() const { return last_status_; }
+
+  // Returns if a worker thread is still associated to this instance.
+  bool is_valid() const;
+
+ private:
+  // Main message loop reference. Used to send notifications in the right
+  // thread.
+  MessageLoop* const ui_message_loop_;
+
+  // All the UI is done in a worker thread because many Win32 print functions
+  // are blocking and enters a message loop without your consent. There is one
+  // worker thread per print job.
+  scoped_ptr<PrintJobWorker> worker_;
+
+  // Cache of the print context settings for access in the UI thread.
+  PrintSettings settings_;
+
+  // Is the Print... dialog box currently shown.
+  bool is_print_dialog_box_shown_;
+
+  // Cookie that make this instance unique.
+  int cookie_;
+
+  // Results from the last GetSettingsDone() callback.
+  PrintingContext::Result last_status_;
+
+  // Task waiting to be executed.
+  scoped_ptr<CancelableTask> callback_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(PrinterQuery);
+};
+
+}  // namespace printing
+
+#endif  // CHROME_BROWSER_PRINTING_PRINTER_QUERY_H__