Optimize shortcuts provider

components/omnibox/browser/autocomplete_result.cc

Index: components/omnibox/browser/autocomplete_result.cc
diff --git a/components/omnibox/browser/autocomplete_result.cc b/components/omnibox/browser/autocomplete_result.cc
index 9e4bf1d769a98938709b48fcf57250ab96408133..c84e80a6522d58b3bd31015f4987446a8fe54dca 100644
--- a/components/omnibox/browser/autocomplete_result.cc
+++ b/components/omnibox/browser/autocomplete_result.cc
@@ -15,91 +15,12 @@
 #include "components/omnibox/browser/autocomplete_input.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/omnibox/browser/autocomplete_provider.h"
+#include "components/omnibox/browser/match_compare.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/omnibox/browser/omnibox_switches.h"
 #include "components/search/search.h"
 #include "components/url_formatter/url_fixer.h"
 
-using metrics::OmniboxEventProto;
-
-namespace {
-
-// This class implements a special version of AutocompleteMatch::MoreRelevant
-// that allows matches of particular types to be demoted in AutocompleteResult.
-class CompareWithDemoteByType {
- public:
-  CompareWithDemoteByType(
-      OmniboxEventProto::PageClassification current_page_classification);
-
-  // Returns the relevance score of |match| demoted appropriately by
-  // |demotions_by_type_|.
-  int GetDemotedRelevance(const AutocompleteMatch& match);
-
-  // Comparison function.
-  bool operator()(const AutocompleteMatch& elem1,
-                  const AutocompleteMatch& elem2);
-
- private:
-  OmniboxFieldTrial::DemotionMultipliers demotions_;
-};
-
-CompareWithDemoteByType::CompareWithDemoteByType(
-    OmniboxEventProto::PageClassification current_page_classification) {
-  OmniboxFieldTrial::GetDemotionsByType(current_page_classification,
-                                        &demotions_);
-}
-
-int CompareWithDemoteByType::GetDemotedRelevance(
-    const AutocompleteMatch& match) {
-  OmniboxFieldTrial::DemotionMultipliers::const_iterator demotion_it =
-      demotions_.find(match.type);
-  return (demotion_it == demotions_.end()) ?
-      match.relevance : (match.relevance * demotion_it->second);
-}
-
-bool CompareWithDemoteByType::operator()(const AutocompleteMatch& elem1,
-                                         const AutocompleteMatch& elem2) {
-  // Compute demoted relevance scores for each match.
-  const int demoted_relevance1 = GetDemotedRelevance(elem1);
-  const int demoted_relevance2 = GetDemotedRelevance(elem2);
-  // For equal-relevance matches, we sort alphabetically, so that providers
-  // who return multiple elements at the same priority get a "stable" sort
-  // across multiple updates.
-  return (demoted_relevance1 == demoted_relevance2) ?
-      (elem1.contents < elem2.contents) :
-      (demoted_relevance1 > demoted_relevance2);
-}
-
-class DestinationSort {
- public:
-  DestinationSort(
-      OmniboxEventProto::PageClassification current_page_classification);
-  bool operator()(const AutocompleteMatch& elem1,
-                  const AutocompleteMatch& elem2);
-
- private:
-  CompareWithDemoteByType demote_by_type_;
-};
-
-DestinationSort::DestinationSort(
-    OmniboxEventProto::PageClassification current_page_classification) :
-    demote_by_type_(current_page_classification) {}
-
-bool DestinationSort::operator()(const AutocompleteMatch& elem1,
-                                 const AutocompleteMatch& elem2) {
-  // Sort identical destination_urls together.  Place the most relevant matches
-  // first, so that when we call std::unique(), these are the ones that get
-  // preserved.
-  if (AutocompleteMatch::DestinationsEqual(elem1, elem2) ||
-      (elem1.stripped_destination_url.is_empty() &&
-       elem2.stripped_destination_url.is_empty())) {
-    return demote_by_type_(elem1, elem2);
-  }
-  return elem1.stripped_destination_url < elem2.stripped_destination_url;
-}
-
-};  // namespace
-
 // static
 const size_t AutocompleteResult::kMaxMatches = 6;
 
@@ -209,12 +130,12 @@ void AutocompleteResult::SortAndCull(
   for (ACMatches::iterator i(matches_.begin()); i != matches_.end(); ++i)
     i->ComputeStrippedDestinationURL(input, languages, template_url_service);
 
-  DedupMatchesByDestination(input.current_page_classification(), true,
-                            &matches_);
+  SortAndDedupMatches(input.current_page_classification(), &matches_);
 
   // Sort and trim to the most relevant kMaxMatches matches.
   size_t max_num_matches = std::min(kMaxMatches, matches_.size());
-  CompareWithDemoteByType comparing_object(input.current_page_classification());
+  CompareWithDemoteByType<AutocompleteMatch>
+      comparing_object(input.current_page_classification());
   std::sort(matches_.begin(), matches_.end(), comparing_object);
   if (!matches_.empty() && !matches_.begin()->allowed_to_be_default_match) {
     // Top match is not allowed to be the default match.  Find the most
@@ -368,27 +289,24 @@ GURL AutocompleteResult::ComputeAlternateNavUrl(
       input.canonicalized_url() : GURL();
 }
 
-void AutocompleteResult::DedupMatchesByDestination(
-      OmniboxEventProto::PageClassification page_classification,
-      bool set_duplicate_matches,
+void AutocompleteResult::SortAndDedupMatches(
+      metrics::OmniboxEventProto::PageClassification page_classification,
       ACMatches* matches) {
-  DestinationSort destination_sort(page_classification);
   // Sort matches such that duplicate matches are consecutive.
-  std::sort(matches->begin(), matches->end(), destination_sort);
-
-  if (set_duplicate_matches) {
-    // Set duplicate_matches for the first match before erasing duplicate
-    // matches.
-    for (ACMatches::iterator i(matches->begin()); i != matches->end(); ++i) {
-      for (int j = 1; (i + j != matches->end()) &&
-               AutocompleteMatch::DestinationsEqual(*i, *(i + j)); ++j) {
-        AutocompleteMatch& dup_match(*(i + j));
-        i->duplicate_matches.insert(i->duplicate_matches.end(),
-                                    dup_match.duplicate_matches.begin(),
-                                    dup_match.duplicate_matches.end());
-        dup_match.duplicate_matches.clear();
-        i->duplicate_matches.push_back(dup_match);
-      }
+  std::sort(matches->begin(), matches->end(),
+      DestinationSort<AutocompleteMatch>(page_classification));
+
+  // Set duplicate_matches for the first match before erasing duplicate
+  // matches.
+  for (ACMatches::iterator i(matches->begin()); i != matches->end(); ++i) {
+    for (int j = 1; (i + j != matches->end()) &&
+             AutocompleteMatch::DestinationsEqual(*i, *(i + j)); ++j) {
+      AutocompleteMatch& dup_match(*(i + j));
+      i->duplicate_matches.insert(i->duplicate_matches.end(),
+                                  dup_match.duplicate_matches.begin(),
+                                  dup_match.duplicate_matches.end());
+      dup_match.duplicate_matches.clear();
+      i->duplicate_matches.push_back(dup_match);
     }
   }
 
@@ -428,7 +346,7 @@ bool AutocompleteResult::HasMatchByDestination(const AutocompleteMatch& match,
 }
 
 void AutocompleteResult::MergeMatchesByProvider(
-    OmniboxEventProto::PageClassification page_classification,
+    metrics::OmniboxEventProto::PageClassification page_classification,
     const ACMatches& old_matches,
     const ACMatches& new_matches) {
   if (new_matches.size() >= old_matches.size())