Improve linearized pdf load/show time.

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 165 matching lines @@
 
     // 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_t GetBackgroundColor() = 0;
 
+    virtual void CancelBrowserDownload() = 0;

[Lei Zhang, 2016/10/21 09:33:09]

Document please.

[snake, 2016/10/21 15:13:15]

Done.

+
     // Sets selection status.
     virtual void IsSelectingChanged(bool is_selecting) {}
   };
 
   // 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
@@ skipping 92 matching lines @@
   // document at page |index|.
   virtual void AppendPage(PDFEngine* engine, int index) = 0;
 
 #if defined(PDF_ENABLE_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,
                       int dpi_y,
                       const pp::Rect& bounds,
@@ skipping 46 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_