Export a function from the PDF plugin to get the dimensions of a PDF page.

pdf/pdfium/pdfium_engine.h

Index: pdf/pdfium/pdfium_engine.h
diff --git a/pdf/pdfium/pdfium_engine.h b/pdf/pdfium/pdfium_engine.h
index 4e764b13218de6ef341dd7e69616dedfa4e05940..9f1006613f71c9217d771b82ae7b531708e353ec 100644
--- a/pdf/pdfium/pdfium_engine.h
+++ b/pdf/pdfium/pdfium_engine.h
@@ -597,7 +597,6 @@ class PDFiumEngineExports : public PDFEngineExports {
  public:
   PDFiumEngineExports() {}
 #if defined(OS_WIN)
-  // See the definition of RenderPDFPageToDC in pdf.cc for details.
   virtual bool RenderPDFPageToDC(const void* pdf_buffer,
                                  int buffer_size,
                                  int page_number,
@@ -614,6 +613,10 @@ class PDFiumEngineExports : public PDFEngineExports {
                              int buffer_size,
                              int* page_count,
                              double* max_page_width);
+
+  virtual bool GetPDFPageSizeByIndex(const void* pdf_buffer,
+                                     int pdf_buffer_size, int page_number,
+                                     double* width, double* height);
 };
 
 }  // namespace chrome_pdf