Adds PrintingContext implementation stub for Android.

chrome/browser/printing/print_view_manager_basic.h

 // Copyright (c) 2013 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 CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASIC_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASIC_H_
 
 #include "chrome/browser/printing/print_view_manager_base.h"
 #include "content/public/browser/web_contents_user_data.h"
 
+#if defined(OS_ANDROID)
+#include "base/file_descriptor_posix.h"
+#endif
+
 namespace printing {
 
 // Manages the print commands for a WebContents - basic version.
 class PrintViewManagerBasic
     : public PrintViewManagerBase,
       public content::WebContentsUserData<PrintViewManagerBasic> {
  public:
   virtual ~PrintViewManagerBasic();
 
+#if defined(OS_ANDROID)
+  // Sets the file descriptor into which PDF will be written.
+  void SetFileDescriptor(const base::FileDescriptor& file_descriptor);
+
+  // Gets the file descriptor into which PDF will be written.
+  base::FileDescriptor GetFileDescriptor() const;
+#endif
+
  private:
   explicit PrintViewManagerBasic(content::WebContents* web_contents);
   friend class content::WebContentsUserData<PrintViewManagerBasic>;
 
+#if defined(OS_ANDROID)
+  // The file descriptor the PDF of the page will be written.
+  base::FileDescriptor file_descriptor_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(PrintViewManagerBasic);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASIC_H_