Switch the background color in PDF Viewer when using Material Design

pdf/pdfium/pdfium_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_PDFIUM_PDFIUM_ENGINE_H_
 #define PDF_PDFIUM_PDFIUM_ENGINE_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 62 matching lines @@
   virtual void StopFind();
   virtual void ZoomUpdated(double new_zoom_level);
   virtual void RotateClockwise();
   virtual void RotateCounterclockwise();
   virtual std::string GetSelectedText();
   virtual std::string GetLinkAtPosition(const pp::Point& point);
   virtual bool IsSelecting();
   virtual bool HasPermission(DocumentPermission permission) const;
   virtual void SelectAll();
   virtual int GetNumberOfPages();
+  virtual uint32 GetBackgroundColor();
+  virtual void SetBackgroundColor(uint32 backgroundColor);
   virtual pp::VarArray GetBookmarks();
   virtual int GetNamedDestinationPage(const std::string& destination);
   virtual pp::VarDictionary GetNamedDestinations();
   virtual int GetFirstVisiblePage();
   virtual int GetMostVisiblePage();
   virtual pp::Rect GetPageRect(int index);
   virtual pp::Rect GetPageContentsRect(int index);
   virtual int GetVerticalScrollbarYPosition() { return position_.y(); }
   virtual void PaintThumbnail(pp::ImageData* image_data, int index);
   virtual void SetGrayscale(bool grayscale);
@@ skipping 581 matching lines @@
   // been called. Only after that can we call FORM_DoPageAAction.
   bool called_do_document_action_;
 
   // Records parts of form fields that need to be highlighted at next paint, in
   // screen coordinates.
   std::vector<pp::Rect> form_highlights_;
 
   // Whether to render in grayscale or in color.
   bool render_grayscale_;
 
+  // Background color of the PDF.
+  uint32 background_color_;
+
   // The link currently under the cursor.
   std::string link_under_cursor_;
 
   // Pending progressive paints.
   struct ProgressivePaint {
     pp::Rect rect;  // In screen coordinates.
     FPDF_BITMAP bitmap;
     int page_index;
     // Temporary used to figure out if in a series of Paint() calls whether this
     // pending paint was updated or not.
@@ skipping 53 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);
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDFIUM_PDFIUM_ENGINE_H_