Add confidence to AutocompleteMatch.

chrome/browser/autocomplete/extension_app_provider.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/autocomplete/extension_app_provider.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/string16.h"
@@ skipping 38 matching lines @@
       string16::const_iterator url_iter = std::search(url.begin(), url.end(),
           input.text().begin(), input.text().end(),
           base::CaseInsensitiveCompare<char16>());
       bool matches_url = url_iter != url.end() &&
                          input.type() != AutocompleteInput::FORCED_QUERY;
 
       if (matches_name || matches_url) {
         // We have a match, might be a partial match.
         // TODO(finnur): Figure out what type to return here, might want to have
         // the extension icon/a generic icon show up in the Omnibox.
-        AutocompleteMatch match(this, 0, false,
+        // TODO(dominich): Confidence would require us to create a match set and
+        // then iterate over to create the AutocompleteMatch objects. Currently
+        // confidence is used for instant/prerender/DNS preconnect and we may
+        // not want to do those for extension apps anyway.
+        AutocompleteMatch match(this, 0, 0.0f, false,
                                 AutocompleteMatch::EXTENSION_APP);
         match.fill_into_edit = url;
         match.destination_url = GURL(url);
         match.inline_autocomplete_offset = string16::npos;
         match.contents = name;
         AutocompleteMatch::ClassifyLocationInString(matches_name ?
             static_cast<size_t>(name_iter - name.begin()) : string16::npos,
             input.text().length(), name.length(), ACMatchClassification::NONE,
             &match.contents_class);
         match.description = url;
@@ skipping 75 matching lines @@
     history::URLRow info;
     url_db->GetRowForURL(url, &info);
     type_count_boost =
         400 * (1.0 - (std::pow(static_cast<double>(2), -info.typed_count())));
   }
   int relevance = 575 + static_cast<int>(type_count_boost) +
                         static_cast<int>(fraction_boost);
   DCHECK_LE(relevance, kMaxRelevance);
   return relevance;
 }