Change media galleries to external file system type to add toURL support

chrome/browser/chrome_content_browser_client.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/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 2529 matching lines @@
     std::vector<std::string>* additional_allowed_schemes) {
   ContentBrowserClient::GetAdditionalAllowedSchemesForFileSystem(
       additional_allowed_schemes);
   additional_allowed_schemes->push_back(content::kChromeDevToolsScheme);
   additional_allowed_schemes->push_back(content::kChromeUIScheme);
   additional_allowed_schemes->push_back(extensions::kExtensionScheme);
 }
 
 void ChromeContentBrowserClient::GetURLRequestAutoMountHandlers(
     std::vector<fileapi::URLRequestAutoMountHandler>* handlers) {
+#if !defined(OS_ANDROID)
+  handlers->push_back(
+      base::Bind(MediaFileSystemBackend::AttemptAutoMountForURLRequest));
+#endif  // OS_ANDROID
 }
 
 void ChromeContentBrowserClient::GetAdditionalFileSystemBackends(
     content::BrowserContext* browser_context,
     const base::FilePath& storage_partition_path,
     ScopedVector<fileapi::FileSystemBackend>* additional_backends) {
 #if !defined(OS_ANDROID)
   base::SequencedWorkerPool* pool = content::BrowserThread::GetBlockingPool();
   additional_backends->push_back(new MediaFileSystemBackend(
       storage_partition_path,
@@ skipping 175 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome