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

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 3d815b12700a504dff8e384297d232fe6a98bf1a..2ce15014818bfe849291028e022e2acc6d478fd4 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -125,8 +125,10 @@
 #endif
 
 #if defined(ENABLE_PRINTING)
+#include "chrome/common/chrome_content_client.h"
 #include "chrome/renderer/printing/chrome_print_web_view_helper_delegate.h"
 #include "components/printing/renderer/print_web_view_helper.h"
+#include "printing/print_settings.h"
 #endif
 
 #if defined(ENABLE_PRINT_PREVIEW)
@@ -355,6 +357,9 @@ ChromeContentRendererClient::ChromeContentRendererClient() {
   for (size_t i = 0; i < arraysize(kPredefinedAllowedCompositorOrigins); ++i)
     allowed_compositor_origins_.insert(kPredefinedAllowedCompositorOrigins[i]);
 #endif
+#if defined(ENABLE_PRINTING)
+  printing::SetAgent(GetUserAgent());
+#endif
 }
 
 ChromeContentRendererClient::~ChromeContentRendererClient() {