Adding CreateFromData to NativeMetafileFactory

printing/native_metafile_factory.h

 // 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.
 
 #ifndef PRINTING_NATIVE_METAFILE_FACTORY_H_
 #define PRINTING_NATIVE_METAFILE_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "printing/native_metafile.h"
 
 namespace printing {
 
 // Various printing contexts will be supported in the future (cairo, skia, emf).
 // So this class returns the appropriate context depending on the platform and
 // user preferences.
 // (Note: For the moment there is only one option per platform.)
 class NativeMetafileFactory {
  public:
   // This method returns a pointer to the appropriate NativeMetafile object
-  // according to the platform.
+  // according to the platform. The metafile is already initialized by invoking
+  // Init() on it. NULL is returned if Init() fails.
   static printing::NativeMetafile* Create();
 
+  // This method returns a pointer to the appropriate NativeMetafile object
+  // according to the platform. The metafile is already initialized by invoking
+  // InitFromData(src_buffer,_buffer_size) on it. NULL is returned if
+  // InitiFromData() fails.
+  static printing::NativeMetafile* CreateFromData(const void* src_buffer,
+                                                  uint32 src_buffer_size);
+
  private:
   NativeMetafileFactory();
+
+  // Retrieves a new uninitialized metafile.
+  static NativeMetafile* CreateNewMetafile();
+
   DISALLOW_COPY_AND_ASSIGN(NativeMetafileFactory);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_NATIVE_METAFILE_FACTORY_H_