mediaview: Implement ArcDocumentsProviderWatcherManager.

chrome/browser/chromeos/fileapi/file_system_backend.cc

 // Copyright 2013 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/fileapi/file_system_backend.h"
 
 #include <stddef.h>
 
 #include <memory>
+#include <utility>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.h"
 #include "chrome/browser/chromeos/fileapi/file_access_permissions.h"
 #include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
 #include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"
 #include "chrome/common/url_constants.h"
 #include "chromeos/chromeos_switches.h"
@@ skipping 274 matching lines @@
     storage::FileSystemType type) {
   if (type == storage::kFileSystemTypeProvided)
     return file_system_provider_delegate_->GetWatcherManager(type);
 
   if (type == storage::kFileSystemTypeDeviceMediaAsFileStorage &&
       !base::CommandLine::ForCurrentProcess()->HasSwitch(
           chromeos::switches::kDisableMtpWriteSupport)) {
     return mtp_delegate_->GetWatcherManager(type);
   }
 
+  if (type == storage::kFileSystemTypeArcDocumentsProvider)
+    return arc_documents_provider_delegate_->GetWatcherManager(type);
+
   // TODO(mtomasz): Add support for other backends.
   return NULL;
 }
 
 storage::CopyOrMoveFileValidatorFactory*
 FileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     storage::FileSystemType type,
     base::File::Error* error_code) {
   DCHECK(error_code);
   *error_code = base::File::FILE_OK;
@@ skipping 172 matching lines @@
     const base::FilePath& entry_path) const {
   base::FilePath virtual_path;
   if (!GetVirtualPath(entry_path, &virtual_path))
     return storage::FileSystemURL();
 
   return context->CreateCrackedFileSystemURL(
       GURL() /* origin */, storage::kFileSystemTypeExternal, virtual_path);
 }
 
 }  // namespace chromeos