cros: Ensure task manager shows correct title for lock screen webview

chrome/browser/chromeos/login/ui/web_contents_forced_title.h

+// Copyright 2016 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_CHROMEOS_LOGIN_UI_WEB_CONTENTS_FORCED_TITLE_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_CONTENTS_FORCED_TITLE_H_
+
+#include "base/strings/string16.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace chromeos {
+
+// Ensures that the title of the WebContents instance this object is attached
+// to is always set to the given title value.
+class WebContentsForcedTitle
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<WebContentsForcedTitle> {
+ public:
+  static void CreateForWebContentsWithTitle(content::WebContents* web_contents,
+                                            const base::string16& title);
+
+  ~WebContentsForcedTitle() override;
+
+ private:
+  WebContentsForcedTitle(content::WebContents* web_contents,
+                         const base::string16& title);
+
+  // content::WebContentsObserver:
+  void TitleWasSet(content::NavigationEntry* entry, bool explicit_set) override;
+
+  base::string16 title_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentsForcedTitle);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_CONTENTS_FORCED_TITLE_H_