PDF: Put back removed SetScrollPosition().

pdf/pdf_engine.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 PDF_PDF_ENGINE_H_
 #define PDF_PDF_ENGINE_H_
 
 #include <stdint.h>
 
 #include "build/build_config.h"
@@ skipping 264 matching lines @@
   //   the same structure.
   virtual pp::VarArray GetBookmarks() = 0;
 
   // Append blank pages to make a 1-page document to a |num_pages| document.
   // Always retain the first page data.
   virtual void AppendBlankPages(int num_pages) = 0;
   // Append the first page of the document loaded with the |engine| to this
   // document at page |index|.
   virtual void AppendPage(PDFEngine* engine, int index) = 0;
 
+#if defined(PDF_USE_XFA)
+  // Allow client to set scroll positions in document coordinates. Note that
+  // this is meant for cases where the device scale factor changes, and not for
+  // general scrolling - the engine will not repaint due to this.
+  virtual void SetScrollPosition(const pp::Point& position) = 0;
+#endif
+
   virtual bool IsProgressiveLoad() = 0;
 
   virtual std::string GetMetadata(const std::string& key) = 0;
 };
 
 // Interface for exports that wrap the PDF engine.
 class PDFEngineExports {
  public:
   struct RenderingSettings {
     RenderingSettings(int dpi_x,
@@ skipping 45 matching lines @@
 
   // See the definition of GetPDFPageSizeByIndex in pdf.cc for details.
   virtual bool GetPDFPageSizeByIndex(const void* pdf_buffer,
                                      int pdf_buffer_size, int page_number,
                                      double* width, double* height) = 0;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDF_ENGINE_H_