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

chrome/browser/garbled_text_helper.h

Index: chrome/browser/garbled_text_helper.h
diff --git a/chrome/browser/garbled_text_helper.h b/chrome/browser/garbled_text_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..d3232c6e8d9a943a4dea47fa1eed1817e44c1d01
--- /dev/null
+++ b/chrome/browser/garbled_text_helper.h
@@ -0,0 +1,68 @@
+// 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_HELPER_H_
+#define CHROME_BROWSER_GARBLED_TEXT_HELPER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/garbled_text_url_tracker.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
+#include "content/public/browser/web_contents_observer.h"
+
+class Profile;
+
+namespace content {
+class WebContents;
+}
+
+// This class is instantiated per tab and lives on UI thread.
+// Once containing text of the page is detected as garbled, the instance prompts
+// the user to enable encoding detection for this site through infobar, and
+// redirects the approval to |GarbledTextService|.
+class GarbledTextHelper : public base::SupportsWeakPtr<GarbledTextHelper>,
+                          public content::WebContentsObserver,
+                          public content::NotificationObserver {
+ public:
+  typedef GarbledTextURLTracker::GarbledURLs GarbledURLs;
+
+  explicit GarbledTextHelper(content::WebContents* web_contents);
+  virtual ~GarbledTextHelper();
+
+ private:
+  friend class GarbledTextHelperTest;
+
+  Profile* GetProfile();
+
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void DidNavigateAnyFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) OVERRIDE;
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
+
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Handles |ViewHostMsg_GarbledTextDetected|.
+  void OnGarbledTextDetected(const GarbledURLs& garbled_urls);
+
+  // Completion callback for |GrabledTextService::UpdateBlacklist()|.
+  void WillFinishUpdatingBlacklist();
+
+  void OnEnableStateChanged(bool enabled);
+
+  // Called when the user accepts enabling encoding detection for |garbled_urls|
+  // through infobar.
+  void EnableEncodingDetection(const GarbledURLs& garbled_urls);
+
+  PrefChangeRegistrar pref_change_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(GarbledTextHelper);
+};
+
+#endif  // CHROME_BROWSER_GARBLED_TEXT_HELPER_H_