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

experimental/PdfViewer/SkPdfGroupAttributesDictionary_autogen.h

 #ifndef __DEFINED__SkPdfGroupAttributesDictionary
 #define __DEFINED__SkPdfGroupAttributesDictionary
 
 #include "SkPdfEnums_autogen.h"
 #include "SkPdfArray_autogen.h"
 #include "SkPdfDictionary_autogen.h"
 
+// Entries common to all group attributes dictionaries
 class SkPdfGroupAttributesDictionary : public SkPdfDictionary {
 public:
   virtual SkPdfObjectType getType() const { return kGroupAttributesDictionary_SkPdfObjectType;}
   virtual SkPdfObjectType getTypeEnd() const { return (SkPdfObjectType)(kGroupAttributesDictionary_SkPdfObjectType + 1);}
 public:
   virtual SkPdfGroupAttributesDictionary* asGroupAttributesDictionary() {return this;}
   virtual const SkPdfGroupAttributesDictionary* asGroupAttributesDictionary() const {return this;}
 
 private:
   virtual SkPdfALinkAnnotationDictionary* asALinkAnnotationDictionary() {return NULL;}
@@ skipping 496 matching lines @@
 
 public:
 private:
 public:
   SkPdfGroupAttributesDictionary(const PdfMemDocument* podofoDoc = NULL, const PdfObject* podofoObj = NULL) : SkPdfDictionary(podofoDoc, podofoObj) {}
 
   virtual bool valid() const {return true;}
 
   SkPdfGroupAttributesDictionary& operator=(const SkPdfGroupAttributesDictionary& from) {this->fPodofoDoc = from.fPodofoDoc; this->fPodofoObj = from.fPodofoObj; return *this;}
 
+/** (Optional) The type of PDF object that this dictionary describes; if present, must
+ *  be Group for a group attributes dictionary.
+**/
+  bool has_Type() const {
+    return (ObjectFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Type", "", NULL));
+  }
+
   std::string Type() const {
     std::string ret;
     if (NameFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Type", "", &ret)) return ret;
     // TODO(edisonn): warn about missing required field, assert for known good pdfs
     return "";
   }
 
+/** (Required) The group subtype, which identifies the type of group whose at-
+ *  tributes this dictionary describes and determines the format and meaning of the
+ *  dictionary's remaining entries. The only group subtype defined in PDF 1.4 is
+ *  Transparency; see Section 7.5.5, "Transparency Group XObjects," for the re-
+ *  maining contents of this type of dictionary. Other group subtypes may be added
+ *  in the future.
+**/
+  bool has_S() const {
+    return (ObjectFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "S", "", NULL));
+  }
+
   std::string S() const {
     std::string ret;
     if (NameFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "S", "", &ret)) return ret;
     // TODO(edisonn): warn about missing required field, assert for known good pdfs
     return "";
   }
 
 };
 
 #endif  // __DEFINED__SkPdfGroupAttributesDictionary