[fsp] Add support for providing thumbnails.

chrome/browser/chromeos/file_manager/filesystem_api_util.cc

 // Copyright 2014 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/file_manager/filesystem_api_util.h"
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 28 matching lines @@
     callback.Run(false, std::string());
     return;
   }
   callback.Run(true, entry->file_specific_info().content_mime_type());
 }
 
 // Helper function used to implement GetNonNativeLocalPathMimeType. It extracts
 // the mime type from the passed metadata from a providing extension.
 void GetMimeTypeAfterGetMetadataForProvidedFileSystem(
     const base::Callback<void(bool, const std::string&)>& callback,
-    const chromeos::file_system_provider::EntryMetadata& metadata,
+    scoped_ptr<chromeos::file_system_provider::EntryMetadata> metadata,
     base::File::Error result) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   if (result != base::File::FILE_OK) {
     callback.Run(false, std::string());
     return;
   }
-  callback.Run(true, metadata.mime_type);
+  callback.Run(true, metadata->mime_type);
 }
 
 // Helper function to converts a callback that takes boolean value to that takes
 // File::Error, by regarding FILE_OK as the only successful value.
 void BoolCallbackAsFileErrorCallback(
     const base::Callback<void(bool)>& callback,
     base::File::Error error) {
   return callback.Run(error == base::File::FILE_OK);
 }
 
@@ skipping 95 matching lines @@
     if (!parser.Parse()) {
       content::BrowserThread::PostTask(
           content::BrowserThread::UI,
           FROM_HERE,
           base::Bind(callback, false, std::string()));
       return;
     }
 
     parser.file_system()->GetMetadata(
         parser.file_path(),
+        chromeos::file_system_provider::ProvidedFileSystemInterface::
+            METADATA_FIELD_DEFAULT,
         base::Bind(&GetMimeTypeAfterGetMetadataForProvidedFileSystem,
                    callback));
     return;
   }
 
   // As a fallback just return success with an empty mime type value.
   content::BrowserThread::PostTask(
       content::BrowserThread::UI,
       FROM_HERE,
       base::Bind(callback, true /* success */, std::string()));
@@ skipping 53 matching lines @@
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(&PrepareFileOnIOThread,
                  make_scoped_refptr(context),
                  context->CrackURL(url),
                  google_apis::CreateRelayCallback(callback)));
 }
 
 }  // namespace util
 }  // namespace file_manager