Linux: Refactor printing to be more like Windows/Mac....

printing/printed_document.h

Index: printing/printed_document.h
===================================================================
--- printing/printed_document.h	(revision 75320)
+++ printing/printed_document.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -27,6 +27,7 @@
 
 class PrintedPage;
 class PrintedPagesSource;
+class PrintingContext;
 
 // A collection of rendered pages. The settings are immutable. If the print
 // settings are changed, a new PrintedDocument must be created.
@@ -55,8 +56,13 @@
 
   // Draws the page in the context.
   // Note: locks for a short amount of time in debug only.
+#if defined(OS_WIN) || defined(OS_MACOSX)
   void RenderPrintedPage(const PrintedPage& page,
                          gfx::NativeDrawingContext context) const;
+#elif defined(OS_POSIX)
+  void RenderPrintedPage(const PrintedPage& page,
+                         PrintingContext* context) const;
+#endif
 
   // Returns true if all the necessary pages for the settings are already
   // rendered.