Add DebugInfo to DistilledPageProto.

components/dom_distiller/standalone/content_extractor.cc

Index: components/dom_distiller/standalone/content_extractor.cc
diff --git a/components/dom_distiller/standalone/content_extractor.cc b/components/dom_distiller/standalone/content_extractor.cc
index 89446e21ab013c52bc472c353f1a8d7d9165fe92..fe7afaee7bf5fd37634f441ec5eadf321a623dca 100644
--- a/components/dom_distiller/standalone/content_extractor.cc
+++ b/components/dom_distiller/standalone/content_extractor.cc
@@ -143,6 +143,8 @@ std::string GetReadableArticleString(
     output << "Page " << i << std::endl;
     output << "URL: " << page.url() << std::endl;
     output << "Content: " << page.html() << std::endl;
+    if (page.has_debug_info() && page.debug_info().has_log())
+      output << "Log: " << page.debug_info().log() << std::endl;
   }
   return output.str();
 }