SkPDF: add basic metadata support

dm/DMSrcSink.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkCodec.h"
@@ skipping 911 matching lines @@
     return "";
 }
 
 PDFSink::PDFSink() {}
 
 Error PDFSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
     SkAutoTUnref<SkDocument> doc(SkDocument::CreatePDF(dst));
     if (!doc) {
         return "SkDocument::CreatePDF() returned nullptr";
     }
+    SkTArray<SkDocument::Attribute> info;
+    info.emplace_back(SkString("Title"), src.name());
+    info.emplace_back(SkString("Subject"),
+                      SkString("rendering correctness test"));
+    info.emplace_back(SkString("Creator"), SkString("Skia/DM"));
+    doc->setMetadata(info, nullptr, nullptr);
     return draw_skdocument(src, doc.get(), dst);
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 XPSSink::XPSSink() {}
 
 Error XPSSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
     SkAutoTUnref<SkDocument> doc(SkDocument::CreateXPS(dst));
     if (!doc) {
@@ skipping 320 matching lines @@
             skr.visit<void>(i, drawsAsSingletonPictures);
         }
         SkAutoTUnref<SkPicture> macroPic(macroRec.endRecordingAsPicture());
 
         canvas->drawPicture(macroPic);
         return "";
     });
 }
 
 }  // namespace DM