Add a scroll offset to PDF documents to account for the top material design toolbar.

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 ff45f457e14c5b72e9395f3bd82624576894ca1e..c8ee6bdb4cb7030edfe5d57411fc4419d1c3e2e7 100644
--- a/pdf/pdfium/pdfium_engine.h
+++ b/pdf/pdfium/pdfium_engine.h
@@ -84,6 +84,7 @@ class PDFiumEngine : public PDFEngine,
   virtual int GetMostVisiblePage();
   virtual pp::Rect GetPageRect(int index);
   virtual pp::Rect GetPageContentsRect(int index);
+  virtual pp::Rect GetPageScreenRect(int page_index) const;
   virtual int GetVerticalScrollbarYPosition() { return position_.y(); }
   virtual void PaintThumbnail(pp::ImageData* image_data, int index);
   virtual void SetGrayscale(bool grayscale);
@@ -373,10 +374,6 @@ class PDFiumEngine : public PDFEngine,
   // Returns the currently visible rectangle in document coordinates.
   pp::Rect GetVisibleRect() const;
 
-  // Returns a page's rect in screen coordinates, as well as its surrounding
-  // border areas and bottom separator.
-  pp::Rect GetPageScreenRect(int page_index) const;
-
   // Given a rectangle in document coordinates, returns the rectange into screen
   // coordinates (i.e. 0,0 is top left corner of plugin area).  If it's not
   // visible, an empty rectangle is returned.