Implement CopyFileFromLocal of MTPDeviceAsyncDelegate.

chrome/browser/media_galleries/media_file_system_registry.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/media_galleries/media_file_system_registry.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 704 matching lines @@
     DCHECK(!StorageInfo::IsMassStorageDevice(device_id));
 
     // Sanity checks for |path|.
     CHECK(MediaStorageUtil::CanCreateFileSystem(device_id, path));
     bool result = ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
         fs_name,
         storage::kFileSystemTypeDeviceMedia,
         storage::FileSystemMountOption(),
         path);
     CHECK(result);
-    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, base::Bind(
-        &MTPDeviceMapService::RegisterMTPFileSystem,
-        base::Unretained(MTPDeviceMapService::GetInstance()),
-        path.value(), fs_name));
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&MTPDeviceMapService::RegisterMTPFileSystem,
+                   base::Unretained(MTPDeviceMapService::GetInstance()),
+                   path.value(), fs_name, true /* read only */));
     return result;
   }
 
   DISALLOW_COPY_AND_ASSIGN(MediaFileSystemContextImpl);
 };
 
 // Constructor in 'private' section because depends on private class definition.
 MediaFileSystemRegistry::MediaFileSystemRegistry()
     : file_system_context_(new MediaFileSystemContextImpl) {
   StorageMonitor::GetInstance()->AddObserver(this);
@@ skipping 97 matching lines @@
   DCHECK_EQ(1U, erase_count);
   if (extension_hosts->second.empty()) {
     // When a profile has no ExtensionGalleriesHosts left, remove the
     // matching gallery-change-watcher since it is no longer needed. Leave the
     // |extension_hosts| entry alone, since it indicates the profile has been
     // previously used.
     MediaGalleriesPreferences* preferences = GetPreferences(profile);
     preferences->RemoveGalleryChangeObserver(this);
   }
 }