Add private PPAPI interfaces for PDFium accessibility.

pdf/pdfium/pdfium_page.h

Index: pdf/pdfium/pdfium_page.h
diff --git a/pdf/pdfium/pdfium_page.h b/pdf/pdfium/pdfium_page.h
index 802ecb64e559cb35ac1515d09ebb358258de3cad..4231fcf9adbad00b8da3c7a101e0a4a7ba023ee0 100644
--- a/pdf/pdfium/pdfium_page.h
+++ b/pdf/pdfium/pdfium_page.h
@@ -46,6 +46,16 @@ class PDFiumPage {
   // Returns a DictionaryValue version of the page.
   base::Value* GetAccessibleContentAsValue(int rotation);
 
+  // Given a start char index, find the longest continuous run of text that's
+  // in a single direction and with the same style and font size. Return the
+  // length of that sequence and its font size and bounding box.
+  void GetTextRunInfo(int start_char_index,
+                      uint32_t* out_len,
+                      double* out_font_size,
+                      pp::FloatRect* out_bounds);
+  // Get the width of a character in page pixels.
+  double GetCharWidth(int char_index);
+
   enum Area {
     NONSELECTABLE_AREA,
     TEXT_AREA,