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

chrome/browser/garbled_text_url_tracker.cc

Index: chrome/browser/garbled_text_url_tracker.cc
diff --git a/chrome/browser/garbled_text_url_tracker.cc b/chrome/browser/garbled_text_url_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..48c467dbf9935a576b9f26a6c855d47fb4682e30
--- /dev/null
+++ b/chrome/browser/garbled_text_url_tracker.cc
@@ -0,0 +1,40 @@
+// 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.
+
+#include "chrome/browser/garbled_text_url_tracker.h"
+
+#include "googleurl/src/gurl.h"
+
+GarbledTextURLTracker::GarbledTextURLTracker(const BooleanPrefMember& enabled,
+                                             const Blacklist& blacklist)
+    : enabled_(enabled), blacklist_(blacklist) {
+}
+
+GarbledTextURLTracker::~GarbledTextURLTracker() {
+}
+
+bool GarbledTextURLTracker::NeedsEncodingDetection(const GURL& url) const {
+  DCHECK(CalledOnValidThread());
+  return enabled_.GetValue() &&
+      blacklist_.find(Normalize(url)) != blacklist_.end();
+}
+
+void GarbledTextURLTracker::UpdateBlacklist(const GarbledURLs& garbled_urls,
+                                            Blacklist* blacklist_delta) {
+  DCHECK(CalledOnValidThread());
+  if (!enabled_.GetValue())
+    return;
+
+  for (GarbledURLs::const_iterator itr = garbled_urls.begin();
+       itr != garbled_urls.end();
+       ++itr) {
+    std::string entry = Normalize(*itr);
+    if (blacklist_.insert(entry).second && blacklist_delta)
+      blacklist_delta->insert(entry);
+  }
+}
+
+std::string GarbledTextURLTracker::Normalize(const GURL& url) const {
+  return url.host();
+}