PDF Printing: embed browser user agent string in PDF metadata.

printing/pdf_metafile_skia.cc

Index: printing/pdf_metafile_skia.cc
diff --git a/printing/pdf_metafile_skia.cc b/printing/pdf_metafile_skia.cc
index bb22792e40bd45e6fca8cfd90e2682a145ba321c..314b6d2bbdc6c4879f71a60f689208ec96e84c0b 100644
--- a/printing/pdf_metafile_skia.cc
+++ b/printing/pdf_metafile_skia.cc
@@ -10,6 +10,7 @@
 #include "base/numerics/safe_conversions.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/time/time.h"
+#include "chrome/common/chrome_content_client.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkDocument.h"
@@ -163,7 +164,9 @@ bool PdfMetafileSkia::FinishDocument() {
     pdf_doc->endPage();
   }
   SkTArray<SkDocument::Attribute> info;
-  info.emplace_back(SkString("Creator"), SkString("Chromium"));
+  std::string user_agent = GetUserAgent();
+  info.emplace_back(SkString("Creator"),
+                    SkString(user_agent.c_str(), user_agent.size()));
   SkTime::DateTime now = TimeToSkTime(base::Time::Now());
   pdf_doc->setMetadata(info, &now, &now);
   if (!pdf_doc->close())