Add functions to collect bookmarks from Pdfium

pdf/pdf_engine.h

Index: pdf/pdf_engine.h
diff --git a/pdf/pdf_engine.h b/pdf/pdf_engine.h
index cb53d3ec93be54d32ac0614b2f8363dc9e46be52..b34d655c4bca56310bc0771d3c2ee34aaf6b7f33 100644
--- a/pdf/pdf_engine.h
+++ b/pdf/pdf_engine.h
@@ -24,6 +24,7 @@
 #include "ppapi/cpp/rect.h"
 #include "ppapi/cpp/size.h"
 #include "ppapi/cpp/url_loader.h"
+#include "ppapi/cpp/var_dictionary.h"
 
 namespace pp {
 class InputEvent;
@@ -247,6 +248,13 @@ class PDFEngine {
   // Returns number of copies to be printed.
   virtual int GetCopiesToPrint() = 0;
 
+  // Returns a nested Dictionary of Bookmarks, containing:

[raymes, 2014/12/16 23:35:53]

nit "containing the following key/values:"

[Alexandre Carlton, 2014/12/17 00:51:13]

Done.

+  // - "title" of type Var(std::string)
+  // - "page" of type Var(int)
+  // - "children" of type VarArray(), with each entry containing a
+  //   VarDictionary of the same structure.
+  virtual pp::VarDictionary GetBookmarks() = 0;

[raymes, 2014/12/16 23:35:53]

Let's return a pp::VarArray here.

+
   // Append blank pages to make a 1-page document to a |num_pages| document.
   // Always retain the first page data.
   virtual void AppendBlankPages(int num_pages) = 0;