Make the PDF viewer background color a property of the instance.

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 "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 155 matching lines @@
     virtual void DocumentHasUnsupportedFeature(const std::string& feature) = 0;
 
     // Notifies the client about document load progress.
     virtual void DocumentLoadProgress(uint32 available, uint32 doc_size) = 0;
 
     // Notifies the client about focus changes for form text fields.
     virtual void FormTextFieldFocusChange(bool in_focus) = 0;
 
     // Returns true if the plugin has been opened within print preview.
     virtual bool IsPrintPreview() = 0;
+
+    // Get the background color of the PDF.
+    virtual uint32 GetBackgroundColor() = 0;
   };
 
   // Factory method to create an instance of the PDF Engine.
   static PDFEngine* Create(Client* client);
 
   virtual ~PDFEngine() {}
   // Most of these functions are similar to the Pepper functions of the same
   // name, so not repeating the description here unless it's different.
   virtual bool New(const char* url) = 0;
   virtual bool New(const char* url,
@@ skipping 53 matching lines @@
   // Callback for timer that's set with ScheduleCallback().
   virtual void OnCallback(int id) = 0;
   // Gets the JSON representation of the PDF file
   virtual std::string GetPageAsJSON(int index) = 0;
   // Gets the PDF document's print scaling preference. True if the document can
   // be scaled to fit.
   virtual bool GetPrintScaling() = 0;
   // Returns number of copies to be printed.
   virtual int GetCopiesToPrint() = 0;
 
-  // Retrieve the background color of the PDF viewer.
-  virtual uint32 GetBackgroundColor() = 0;
-  // Set the background color of the PDF viewer.
-  virtual void SetBackgroundColor(uint32 background_color) = 0;
-
   // Returns a VarArray of Bookmarks, each a VarDictionary containing the
   // following key/values:
   // - "title" - a string Var.
   // - "page" - an int Var.
   // - "children" - a VarArray(), with each entry containing a VarDictionary of
   //   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.
@@ skipping 64 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_