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

experimental/PdfViewer/SkPdfRadioButtonFieldDictionary_autogen.h

 #ifndef __DEFINED__SkPdfRadioButtonFieldDictionary
 #define __DEFINED__SkPdfRadioButtonFieldDictionary
 
 #include "SkPdfEnums_autogen.h"
 #include "SkPdfArray_autogen.h"
 #include "SkPdfDictionary_autogen.h"
 
+// Additional entry specific to a radio button field
 class SkPdfRadioButtonFieldDictionary : public SkPdfDictionary {
 public:
   virtual SkPdfObjectType getType() const { return kRadioButtonFieldDictionary_SkPdfObjectType;}
   virtual SkPdfObjectType getTypeEnd() const { return (SkPdfObjectType)(kRadioButtonFieldDictionary_SkPdfObjectType + 1);}
 public:
   virtual SkPdfRadioButtonFieldDictionary* asRadioButtonFieldDictionary() {return this;}
   virtual const SkPdfRadioButtonFieldDictionary* asRadioButtonFieldDictionary() const {return this;}
 
 private:
   virtual SkPdfALinkAnnotationDictionary* asALinkAnnotationDictionary() {return NULL;}
@@ skipping 496 matching lines @@
 
 public:
 private:
 public:
   SkPdfRadioButtonFieldDictionary(const PdfMemDocument* podofoDoc = NULL, const PdfObject* podofoObj = NULL) : SkPdfDictionary(podofoDoc, podofoObj) {}
 
   virtual bool valid() const {return true;}
 
   SkPdfRadioButtonFieldDictionary& operator=(const SkPdfRadioButtonFieldDictionary& from) {this->fPodofoDoc = from.fPodofoDoc; this->fPodofoObj = from.fPodofoObj; return *this;}
 
+/** (Optional; inheritable; PDF 1.4) An array of text strings to be used in
+ *  place of the V entries for the values of the widget annotations repre-
+ *  senting the individual radio buttons. Each element in the array repre-
+ *  sents the export value of the corresponding widget annotation in the
+ *  Kids array of the radio button field.
+**/
+  bool has_Opt() const {
+    return (ObjectFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Opt", "", NULL));
+  }
+
   SkPdfArray Opt() const {
     SkPdfArray ret;
     if (ArrayFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Opt", "", &ret)) return ret;
     // TODO(edisonn): warn about missing required field, assert for known good pdfs
     return SkPdfArray();
   }
 
 };
 
 #endif  // __DEFINED__SkPdfRadioButtonFieldDictionary