Make largest_changestamp setter/getter asynchronous.

chrome/browser/chromeos/drive/drive_feed_processor.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/chromeos/drive/drive_feed_processor.h"
 
 #include <utility>
 
 #include "base/metrics/histogram.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/drive_resource_metadata.h"
 #include "chrome/browser/chromeos/drive/resource_entry_conversion.h"
 #include "chrome/browser/google_apis/gdata_wapi_parser.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
 namespace drive {
 
+namespace {
+
+// Callback for DriveResourceMetadata::SetLargestChangestamp.
+// Runs |on_complete_callback|. |on_complete_callback| must not be null.
+void RunOnCompleteCallback(const base::Closure& on_complete_callback,
+                           DriveFileError error) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!on_complete_callback.is_null());
+  DCHECK_EQ(DRIVE_FILE_OK, error);
+
+  on_complete_callback.Run();
+}
+
+}  // namespace
+
 class DriveFeedProcessor::FeedToEntryProtoMapUMAStats {
  public:
   FeedToEntryProtoMapUMAStats()
     : num_regular_files_(0),
       num_hosted_documents_(0) {
   }
 
   // Increment number of files.
   void IncrementNumFiles(bool is_hosted_document) {
     is_hosted_document ? num_hosted_documents_++ : num_regular_files_++;
@@ skipping 345 matching lines @@
     const FilePath& /* root_path */,
     scoped_ptr<DriveEntryProto> /* root_proto */) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   LOG_IF(WARNING, error != DRIVE_FILE_OK) << "Failed to refresh root directory";
 
   OnComplete();
 }
 
 void DriveFeedProcessor::OnComplete() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK(!on_complete_callback_.is_null());
 
   resource_metadata_->set_loaded(true);
-  resource_metadata_->set_largest_changestamp(largest_changestamp_);
-  on_complete_callback_.Run();
+  resource_metadata_->SetLargestChangestamp(
+      largest_changestamp_,
+      base::Bind(&RunOnCompleteCallback, on_complete_callback_));
 }
 
 void DriveFeedProcessor::Clear() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   entry_proto_map_.clear();
   changed_dirs_.clear();
   root_upload_url_ = GURL();
   largest_changestamp_ = 0;
   on_complete_callback_.Reset();
 }
 
 }  // namespace drive