Add confidence to AutocompleteMatch.

Calculated by each provider using whatever measure makes sense and stored as a float in the range [0, 1]. Will be used for determining benefit of using instant, prerender, DNS preconnect to increase success rate and avoid wasted resources.

Currently fed into UMA to validate experiment.

BUG=None
TEST=None


Review URL: http://codereview.chromium.org/7607007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96446 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 0 deletions

diff --git a/chrome/browser/autocomplete/autocomplete_match.h b/chrome/browser/autocomplete/autocomplete_match.h
index fbf8355..6fbb780 100644
--- a/chrome/browser/autocomplete/autocomplete_match.h
+++ b/chrome/browser/autocomplete/autocomplete_match.h
@@ -85,6 +85,7 @@ struct AutocompleteMatch {
   AutocompleteMatch();
   AutocompleteMatch(AutocompleteProvider* provider,
                     int relevance,
+                    float confidence,
                     bool deletable,
                     Type type);
   ~AutocompleteMatch();
@@ -139,6 +140,10 @@ struct AutocompleteMatch {
   // rather than being a fairly fixed value defined by the table above.
   int relevance;
 
+  // The confidence of the match. Calculated per provider and a measure in the
+  // range [0, 1].
+  float confidence;
+
   // True if the user should be able to delete this match.
   bool deletable;