PDF: Use PDF metadata for the title instead of the last path element.

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 261 matching lines @@
   // document at page |index|.
   virtual void AppendPage(PDFEngine* engine, int index) = 0;
 
   // Allow client to query and reset 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 pp::Point GetScrollPosition() = 0;
   virtual void SetScrollPosition(const pp::Point& position) = 0;
 
   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,
                       bool fit_to_bounds,
@@ skipping 41 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_