MD Downloads: track downloads in C++, dispatch discrete JS updates

chrome/browser/download/download_query.h

Index: chrome/browser/download/download_query.h
diff --git a/chrome/browser/download/download_query.h b/chrome/browser/download/download_query.h
index baa5190c84618ce03ccb0f87e9bc35b45a576d19..22ea2bf542b959c6c85b59b679192aaa27ab1a3c 100644
--- a/chrome/browser/download/download_query.h
+++ b/chrome/browser/download/download_query.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/callback_forward.h"
+#include "base/strings/string16.h"
 #include "content/public/browser/download_item.h"
 
 namespace base {
@@ -90,6 +91,9 @@ class DownloadQuery {
     DESCENDING,
   };
 
+  static bool MatchesQuery(const std::vector<base::string16>& query_terms,
+                           const content::DownloadItem& item);
+
   DownloadQuery();
   ~DownloadQuery();