Adds PrintingContext implementation stub for Android.

printing/metafile.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 PRINTING_METAFILE_H_
 #define PRINTING_METAFILE_H_
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "printing/printing_export.h"
@@ skipping 11 matching lines @@
 class FilePath;
 }
 
 namespace gfx {
 class Rect;
 class Size;
 }
 
 class SkDevice;
 
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 namespace base {
 struct FileDescriptor;
 }
 #endif
 
 namespace printing {
 
 // This class creates a graphics context that renders into a data stream
 // (usually PDF or EMF).
 class PRINTING_EXPORT Metafile {
@@ skipping 105 matching lines @@
 
   virtual HENHMETAFILE emf() const = 0;
 #elif defined(OS_MACOSX)
   // Renders the given page into |rect| in the given context.
   // Pages use a 1-based index. The rendering uses the arguments in
   // |params| to determine scaling, translation, and rotation.
   virtual bool RenderPage(unsigned int page_number,
                           gfx::NativeDrawingContext context,
                           const CGRect rect,
                           const MacRenderPageParams& params) const = 0;
-#elif defined(OS_CHROMEOS)
+#elif defined(OS_CHROMEOS) || defined(OS_ANDROID)
   // Saves the underlying data to the file associated with fd. This function
   // should ONLY be called after the metafile is closed.
   // Returns true if writing succeeded.
   virtual bool SaveToFD(const base::FileDescriptor& fd) const = 0;
-#endif  // if defined(OS_CHROMEOS)
+#endif  // if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_METAFILE_H_