arc: Implement Read and GetFileSize for ARC content file system

chrome/browser/ui/ash/chrome_shell_delegate.cc

 // 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/ui/ash/chrome_shell_delegate.h"
 
 #include <stddef.h>
 
 #include <limits>
 
@@ skipping 11 matching lines @@
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "build/build_config.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h"
 #include "chrome/browser/chromeos/background/ash_wallpaper_delegate.h"
 #include "chrome/browser/chromeos/display/display_configuration_observer.h"
 #include "chrome/browser/chromeos/display/display_preferences.h"
 #include "chrome/browser/chromeos/policy/display_rotation_default_handler.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/system/input_device_settings.h"
 #include "chrome/browser/chromeos/ui/accessibility_focus_ring_controller.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ skipping 361 matching lines @@
 }
 
 void ChromeShellDelegate::Exit() {
   chrome::AttemptUserExit();
 }
 
 void ChromeShellDelegate::OpenUrlFromArc(const GURL& url) {
   if (!url.is_valid())
     return;
 
+  GURL url_to_open = url;
+  if (url.SchemeIs(url::kFileScheme) || url.SchemeIs(url::kContentScheme)) {
+    // Chrome cannot open this URL. Read the contents via ARC content file
+    // system with an external file URL.
+    url_to_open = arc::ArcUrlToExternalFileUrl(url_to_open);
+  }
+
   chrome::ScopedTabbedBrowserDisplayer displayer(
       ProfileManager::GetActiveUserProfile());
   chrome::AddSelectedTabWithURL(
-      displayer.browser(), url,
+      displayer.browser(), url_to_open,
       ui::PageTransitionFromInt(ui::PAGE_TRANSITION_LINK |
                                 ui::PAGE_TRANSITION_FROM_API));
 
   // Since the ScopedTabbedBrowserDisplayer does not guarantee that the
   // browser will be shown on the active desktop, we ensure the visibility.
   multi_user_util::MoveWindowToCurrentDesktop(
       displayer.browser()->window()->GetNativeWindow());
 }
 
 app_list::AppListPresenter* ChromeShellDelegate::GetAppListPresenter() {
@@ skipping 125 matching lines @@
       NOTREACHED() << "Unexpected notification " << type;
   }
 }
 
 void ChromeShellDelegate::PlatformInit() {
   registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED,
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
 }