Remove confidence from AutocompleteMatch and use History DB instead.

Adds a class responsible for providing recommended actions given an AutocompleteMatch which uses the History Database to determine that action.

BUG=92896,94423
TEST=NetworkActionPredictorTest*


Review URL: http://codereview.chromium.org/7686012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99140 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 45 insertions, 0 deletions

diff --git a/chrome/browser/autocomplete/network_action_predictor.h b/chrome/browser/autocomplete/network_action_predictor.h
new file mode 100644
index 0000000..5be8597
--- /dev/null
+++ b/chrome/browser/autocomplete/network_action_predictor.h
@@ -0,0 +1,45 @@
+// 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.
+
+#ifndef CHROME_BROWSER_AUTOCOMPLETE_NETWORK_ACTION_PREDICTOR_H_
+#define CHROME_BROWSER_AUTOCOMPLETE_NETWORK_ACTION_PREDICTOR_H_
+#pragma once
+
+#include "base/string16.h"
+
+struct AutocompleteMatch;
+class Profile;
+
+// This class is responsible for determining the correct predictive network
+// action to take given for a given AutocompleteMatch and entered text.
+class NetworkActionPredictor {
+ public:
+  enum Action {
+    ACTION_PRERENDER = 0,
+    ACTION_PRECONNECT,
+    ACTION_NONE,
+    LAST_PREDICT_ACTION = ACTION_NONE
+  };
+
+  explicit NetworkActionPredictor(Profile* profile);
+  virtual ~NetworkActionPredictor();
+
+  // Return the recommended action given |user_text|, the text the user has
+  // entered in the Omnibox, and |match|, the suggestion from Autocomplete.
+  // This method uses information from the ShortcutsBackend including how much
+  // of the matching entry the user typed, and how long it's been since the user
+  // visited the matching URL, to calculate a score between 0 and 1. This score
+  // is then mapped to an Action.
+  Action RecommendAction(const string16& user_text,
+                         const AutocompleteMatch& match) const;
+
+  // Return true if the suggestion type warrants a TCP/IP preconnection.
+  // i.e., it is now quite likely that the user will select the related domain.
+  static bool IsPreconnectable(const AutocompleteMatch& match);
+
+ private:
+  Profile* profile_;
+};
+
+#endif  // CHROME_BROWSER_AUTOCOMPLETE_NETWORK_ACTION_PREDICTOR_H_