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

pdf/out_of_process_instance.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_OUT_OF_PROCESS_INSTANCE_H_
 #define PDF_OUT_OF_PROCESS_INSTANCE_H_
 
 #include <queue>
 #include <set>
 #include <string>
@@ skipping 118 matching lines @@
                     bool case_sensitive,
                     std::vector<SearchStringResult>* results) override;
   void DocumentPaintOccurred() override;
   void DocumentLoadComplete(int page_count) override;
   void DocumentLoadFailed() override;
   pp::Instance* GetPluginInstance() override;
   void DocumentHasUnsupportedFeature(const std::string& feature) override;
   void DocumentLoadProgress(uint32 available, uint32 doc_size) override;
   void FormTextFieldFocusChange(bool in_focus) override;
   bool IsPrintPreview() override;
+  uint32 GetBackgroundColor() override;
 
   // PreviewModeClient::Client implementation.
   void PreviewDocumentLoadComplete() override;
   void PreviewDocumentLoadFailed() override;
 
   // Helper functions for implementing PPP_PDF.
   void RotateClockwise();
   void RotateCounterclockwise();
 
  private:
@@ skipping 183 matching lines @@
   // If true, this means we told the RenderView that we're starting a network
   // request so that it can start the throbber. We will tell it again once the
   // document finishes loading.
   bool did_call_start_loading_;
 
   // If this is true, then don't scroll the plugin in response to DidChangeView
   // messages. This will be true when the extension page is in the process of
   // zooming the plugin so that flickering doesn't occur while zooming.
   bool stop_scrolling_;
 
+  // The background color of the PDF viewer.
+  uint32 background_color_;
+
   // The callback for receiving the password from the page.
   scoped_ptr<pp::CompletionCallbackWithOutput<pp::Var> > password_callback_;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_OUT_OF_PROCESS_INSTANCE_H_