Deal with ca and CA transparency operators in pdf. add comments to generated classes.

experimental/PdfViewer/SkPdfMultiMasterFontDictionary_autogen.h

Index: experimental/PdfViewer/SkPdfMultiMasterFontDictionary_autogen.h
===================================================================
--- experimental/PdfViewer/SkPdfMultiMasterFontDictionary_autogen.h	(revision 9684)
+++ experimental/PdfViewer/SkPdfMultiMasterFontDictionary_autogen.h	(working copy)
@@ -23,6 +23,10 @@
 
   SkPdfMultiMasterFontDictionary& operator=(const SkPdfMultiMasterFontDictionary& from) {this->fPodofoDoc = from.fPodofoDoc; this->fPodofoObj = from.fPodofoObj; return *this;}
 
+  bool has_Subtype() const {
+    return (ObjectFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Subtype", "", NULL));
+  }
+
   std::string Subtype() const {
     std::string ret;
     if (NameFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Subtype", "", &ret)) return ret;