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

See https://codereview.chromium.org/2512473004/ for additional context.

BUG=669638

Review-Url: https://codereview.chromium.org/2550263002
Cr-Commit-Position: refs/heads/master@{#437969}

chrome/app/chromeos_strings.grdp

@@ -2164,6 +2164,9 @@ Press any key to continue exploring.
   <message name="IDS_KIOSK_APPS_BUTTON" desc="Text shown on a button that brings up the kiosk apps menu on login screen">
     Apps
   </message>
+  <message name="IDS_LOCK_SCREEN_TASK_MANAGER_NAME" desc="The name of the lock screen as it appears in the task manager. This will be prefixed with another string, such as 'Extension: ' (see IDS_TASK_MANAGER_EXTENSION_PREFIX)">
+    Lock Screen
+  </message>
   <message name="IDS_LOGIN_USER_ADDING_BANNER" desc="Text shown on a banner in user adding screen.">
     Add an account to multiple sign-in. All signed-in accounts can be accessed without a password, so this feature should only be used with trusted accounts.
   </message>

chrome/browser/chromeos/BUILD.gn

@@ -887,6 +887,8 @@ source_set("chromeos") {
     "login/ui/user_adding_screen.h",
     "login/ui/user_adding_screen_input_methods_controller.cc",
     "login/ui/user_adding_screen_input_methods_controller.h",
+    "login/ui/web_contents_forced_title.cc",
+    "login/ui/web_contents_forced_title.h",
     "login/ui/web_contents_set_background_color.cc",
     "login/ui/web_contents_set_background_color.h",
     "login/ui/web_view_handle.cc",

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

+// 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.
+
+#include "chrome/browser/chromeos/login/ui/web_contents_forced_title.h"
+
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/web_contents.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(chromeos::WebContentsForcedTitle);
+
+namespace chromeos {
+
+// static
+void WebContentsForcedTitle::CreateForWebContentsWithTitle(
+    content::WebContents* web_contents,
+    const base::string16& title) {
+  if (FromWebContents(web_contents))
+    return;
+
+  web_contents->UpdateTitleForEntry(nullptr, title);
+  web_contents->SetUserData(UserDataKey(),
+                            new WebContentsForcedTitle(web_contents, title));
+}
+
+WebContentsForcedTitle::WebContentsForcedTitle(
+    content::WebContents* web_contents,
+    const base::string16& title)
+    : content::WebContentsObserver(web_contents), title_(title) {}
+
+WebContentsForcedTitle::~WebContentsForcedTitle() {}
+
+void WebContentsForcedTitle::TitleWasSet(content::NavigationEntry* entry,
+                                         bool explicit_set) {
+  if (!entry || entry->GetTitle() != title_)
+    web_contents()->UpdateTitleForEntry(entry, title_);
+}
+
+}  // namespace chromeos

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_

chrome/browser/chromeos/login/ui/webui_login_view.cc

@@ -24,6 +24,7 @@
 #include "chrome/browser/chromeos/login/ui/proxy_settings_dialog.h"
 #include "chrome/browser/chromeos/login/ui/shared_web_view.h"
 #include "chrome/browser/chromeos/login/ui/shared_web_view_factory.h"
+#include "chrome/browser/chromeos/login/ui/web_contents_forced_title.h"
 #include "chrome/browser/chromeos/login/ui/web_contents_set_background_color.h"
 #include "chrome/browser/chromeos/login/ui/web_view_handle.h"
 #include "chrome/browser/chromeos/login/ui/webui_login_display.h"
@@ -269,9 +270,13 @@ WebUILoginView::~WebUILoginView() {
 }
 
 // static
-void WebUILoginView::InitializeWebView(views::WebView* web_view) {
+void WebUILoginView::InitializeWebView(views::WebView* web_view,
+                                       const base::string16& title) {
   WebContents* web_contents = web_view->GetWebContents();
 
+  if (!title.empty())
+    WebContentsForcedTitle::CreateForWebContentsWithTitle(web_contents, title);
+
   WebContentsSetBackgroundColor::CreateForWebContentsWithColor(
       web_contents, SK_ColorTRANSPARENT);
 
@@ -311,7 +316,7 @@ void WebUILoginView::Init() {
 
   WebContents* web_contents = web_view()->GetWebContents();
   if (!is_reusing_webview_)
-    InitializeWebView(web_view());
+    InitializeWebView(web_view(), settings_.web_view_title);
 
   web_view()->set_allow_accelerators(true);
   AddChildView(web_view());

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

@@ -47,6 +47,10 @@ class WebUILoginView : public views::View,
   struct WebViewSettings {
     // URL of the WebView to preload and reuse across WebUILoginView instances.
     GURL preloaded_url;
+
+    // Title of the web contents. This will be shown in the task manager. If
+    // empty, the default webview title will be used.
+    base::string16 web_view_title;
   };
 
   // Internal class name.
@@ -111,7 +115,8 @@ class WebUILoginView : public views::View,
   }
 
  protected:
-  static void InitializeWebView(views::WebView* web_view);
+  static void InitializeWebView(views::WebView* web_view,
+                                const base::string16& title);
 
   // Overridden from views::View:
   void Layout() override;