drive: Add showroot=true to WAPI feed URLs and ignore "no parent" entries.

chrome/browser/chromeos/drive/change_list_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/change_list_processor.h"
 
 #include <utility>
 
 #include "base/metrics/histogram.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
@@ skipping 334 matching lines @@
     }
 
     for (size_t j = 0; j < feed->entries().size(); ++j) {
       const google_apis::ResourceEntry* entry = feed->entries()[j];
       DriveEntryProto entry_proto =
           ConvertResourceEntryToDriveEntryProto(*entry);
       // Some document entries don't map into files (i.e. sites).
       if (entry_proto.resource_id().empty())
         continue;
 
+      // TODO(haruki): Apply mapping from an empty parent to special dummy
+      // directory here or in ConvertResourceEntryToDriveEntryProto. See
+      // http://crbug.com/174233 http://crbug.com/171207. Until we implement it,
+      // ChangeListProcessor ignores such "no parent" entries.
+      // Please note that this will cause a temporal issue when
+      // - The user unselect all the parent using drive.google.com UI.
+      // ChangeListProcessor just ignores the incoming changes and keeps stale
+      // metadata. We need to work on this ASAP to reduce confusion.
+      if (entry_proto.parent_resource_id().empty()) {
+        continue;
+      }
+
       // Count the number of files.
       if (uma_stats && !entry_proto.file_info().is_directory()) {
         uma_stats->IncrementNumFiles(
             entry_proto.file_specific_info().is_hosted_document());
       }
 
       std::pair<DriveEntryProtoMap::iterator, bool> ret = entry_proto_map_.
           insert(std::make_pair(entry_proto.resource_id(), entry_proto));
       DCHECK(ret.second);
       if (!ret.second)
@@ skipping 68 matching lines @@
   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