[Garbled Text][Infobar] Adding infobar to suggest turning on encoding detection.

chrome/browser/garbled_text_url_tracker.h

Index: chrome/browser/garbled_text_url_tracker.h
diff --git a/chrome/browser/garbled_text_url_tracker.h b/chrome/browser/garbled_text_url_tracker.h
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+// Copyright (c) 2012 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_GARBLED_TEXT_URL_TRACKER_H_
+#define CHROME_BROWSER_GARBLED_TEXT_URL_TRACKER_H_
+#pragma once
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "base/threading/non_thread_safe.h"
+#include "chrome/browser/prefs/pref_member.h"
+
+class GURL;
+
+// Holds URLs for which we want to run the encoding detector.  The instance is
+// held by ProfileIOData and lives on IO thread.
+class GarbledTextURLTracker
+    : public base::SupportsWeakPtr<GarbledTextURLTracker>,
+      public base::NonThreadSafe {
+ public:
+  typedef std::vector<GURL> GarbledURLs;
+  typedef std::set<std::string> Blacklist;
+
+  GarbledTextURLTracker(const BooleanPrefMember& enabled,
+                        const Blacklist& blacklist);
+  ~GarbledTextURLTracker();
+
+  // Returns true if we should run the encoding detector for the resource.
+  // If |enabled_| is false, the function returns false.
+  bool NeedsEncodingDetection(const GURL& url) const;
+
+  // Adds normalized |garbled_urls| to the blacklist and return the delta as
+  // |blacklist_delta|.  Does nothing if |enabled_| is false.
+  void UpdateBlacklist(const GarbledURLs& garbled_urls,
+                       Blacklist* blacklist_delta);
+
+ private:
+  friend class GarbledTextHelperTest;
+  friend class GarbledTextServiceTest;
+
+  // Returns the normalized representation of the given |url|, with which we
+  // actually register and compare URLs internally.
+  // Currently this method naively returns the host part of the given |url|
+  // (i.e. url.host()), assuming that if a page needs encoding detection other
+  // pages on the same site would need it as well.
+  std::string Normalize(const GURL& url) const;
+
+  const BooleanPrefMember& enabled_;
+  Blacklist blacklist_;
+
+  DISALLOW_COPY_AND_ASSIGN(GarbledTextURLTracker);
+};
+
+#endif  // CHROME_BROWSER_GARBLED_TEXT_URL_TRACKER_H_