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

experimental/PdfViewer/SkPdfComponentsWithMetadataDictionary_autogen.h

 #ifndef __DEFINED__SkPdfComponentsWithMetadataDictionary
 #define __DEFINED__SkPdfComponentsWithMetadataDictionary
 
 #include "SkPdfEnums_autogen.h"
 #include "SkPdfArray_autogen.h"
 #include "SkPdfDictionary_autogen.h"
 
+// Additional entry for components having metadata
 class SkPdfComponentsWithMetadataDictionary : public SkPdfDictionary {
 public:
   virtual SkPdfObjectType getType() const { return kComponentsWithMetadataDictionary_SkPdfObjectType;}
   virtual SkPdfObjectType getTypeEnd() const { return (SkPdfObjectType)(kComponentsWithMetadataDictionary_SkPdfObjectType + 1);}
 public:
   virtual SkPdfComponentsWithMetadataDictionary* asComponentsWithMetadataDictionary() {return this;}
   virtual const SkPdfComponentsWithMetadataDictionary* asComponentsWithMetadataDictionary() const {return this;}
 
 private:
   virtual SkPdfALinkAnnotationDictionary* asALinkAnnotationDictionary() {return NULL;}
@@ skipping 496 matching lines @@
 
 public:
 private:
 public:
   SkPdfComponentsWithMetadataDictionary(const PdfMemDocument* podofoDoc = NULL, const PdfObject* podofoObj = NULL) : SkPdfDictionary(podofoDoc, podofoObj) {}
 
   virtual bool valid() const {return true;}
 
   SkPdfComponentsWithMetadataDictionary& operator=(const SkPdfComponentsWithMetadataDictionary& from) {this->fPodofoDoc = from.fPodofoDoc; this->fPodofoObj = from.fPodofoObj; return *this;}
 
+/** (Optional; PDF 1.4) A metadata stream containing metadata for the component.
+**/
+  bool has_Metadata() const {
+    return (ObjectFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Metadata", "", NULL));
+  }
+
   SkPdfStream Metadata() const {
     SkPdfStream ret;
     if (StreamFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Metadata", "", &ret)) return ret;
     // TODO(edisonn): warn about missing required field, assert for known good pdfs
     return SkPdfStream();
   }
 
 };
 
 #endif  // __DEFINED__SkPdfComponentsWithMetadataDictionary