gdata: Fix a bug that caused histograms on gdata files to be skewed.

chrome/browser/chromeos/gdata/gdata_file_system.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/gdata/gdata_file_system.h"
 
 #include <errno.h>
 #include <sys/stat.h>
 
 #include <set>
@@ skipping 3630 matching lines @@
     return error;
 
   ApplyFeedFromFileUrlMap(
       is_delta_feed,
       is_delta_feed ? delta_feed_changestamp : root_feed_changestamp,
       &file_map);
 
   if (should_notify_initial_load)
     NotifyInitialLoadFinished();
 
-  const int num_total_files = num_hosted_documents + num_regular_files;
-  UMA_HISTOGRAM_COUNTS("GData.NumberOfRegularFiles", num_regular_files);
-  UMA_HISTOGRAM_COUNTS("GData.NumberOfHostedDocuments",
-                       num_hosted_documents);
-  UMA_HISTOGRAM_COUNTS("GData.NumberOfTotalFiles", num_total_files);
+  // Shouldn't record histograms when processing delta feeds.
+  if (!is_delta_feed) {
+    const int num_total_files = num_hosted_documents + num_regular_files;
+    UMA_HISTOGRAM_COUNTS("GData.NumberOfRegularFiles", num_regular_files);
+    UMA_HISTOGRAM_COUNTS("GData.NumberOfHostedDocuments",
+                         num_hosted_documents);
+    UMA_HISTOGRAM_COUNTS("GData.NumberOfTotalFiles", num_total_files);
+  }
   return base::PLATFORM_FILE_OK;
 }
 
 void GDataFileSystem::ApplyFeedFromFileUrlMap(
     bool is_delta_feed,
     int feed_changestamp,
     FileResourceIdMap* file_map) {
   lock_.AssertAcquired();
   // Don't send directory content change notification while performing
   // the initial content retrieval.
@@ skipping 1595 matching lines @@
   pref_registrar_->Init(profile_->GetPrefs());
   pref_registrar_->Add(prefs::kDisableGDataHostedFiles, this);
 }
 
 void SetFreeDiskSpaceGetterForTesting(FreeDiskSpaceGetterInterface* getter) {
   delete global_free_disk_getter_for_testing;  // Safe to delete NULL;
   global_free_disk_getter_for_testing = getter;
 }
 
 }  // namespace gdata