Mirror syncfs log to console and WebUI, with LogSeverity support.

chrome/browser/sync_file_system/local_file_sync_service.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/sync_file_system/local_file_sync_service.h"
 
 #include "base/stl_util.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync_file_system/local_change_processor.h"
+#include "chrome/browser/sync_file_system/logger.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/storage_partition.h"
 #include "googleurl/src/gurl.h"
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_url.h"
 #include "webkit/fileapi/syncable/file_change.h"
 #include "webkit/fileapi/syncable/local_file_change_tracker.h"
 #include "webkit/fileapi/syncable/local_file_sync_context.h"
@@ skipping 171 matching lines @@
   if (!ContainsKey(origin_to_contexts_, url.origin())) {
     // This could happen if a remote sync is triggered for the app that hasn't
     // been initialized in this service.
     DCHECK(profile_);
     // The given url.origin() must be for valid installed app.
     ExtensionService* extension_service =
         extensions::ExtensionSystem::Get(profile_)->extension_service();
     const extensions::Extension* extension = extension_service->GetInstalledApp(
         url.origin());
     if (!extension) {
-      LOG(WARNING) << "PrepareForProcessRemoteChange called for non-existing "
-                   << " origin:" << url.origin().spec();
+      std::string warn_msg = std::string(

[nhiroki, 2013/05/22 05:42:40]

How about using std::ostringstream?

[calvinlo, 2013/05/22 08:42:56]

Done.

+          "PrepareForProcessRemoteChange called for non-existing origin:")

[nhiroki, 2013/05/22 05:42:40]

super-nit: s/origin:/origin: / for readability

[calvinlo, 2013/05/22 08:42:56]

Done.

+              .append(url.origin().spec());
+      util::Log(logging::LOG_WARNING, warn_msg);
+
       // The extension has been uninstalled and this method is called
       // before the remote changes for the origin are removed.
       callback.Run(SYNC_STATUS_NO_CHANGE_TO_SYNC,
                    SyncFileMetadata(), FileChangeList());
       return;
     }
     GURL site_url = extension_service->GetSiteForExtensionId(extension->id());
     DCHECK(!site_url.is_empty());
     scoped_refptr<fileapi::FileSystemContext> file_system_context =
         content::BrowserContext::GetStoragePartitionForSite(
@@ skipping 199 matching lines @@
       changes.front(),
       sync_file_info.local_file_path,
       sync_file_info.metadata,
       url,
       base::Bind(&LocalFileSyncService::ProcessNextChangeForURL,
                  AsWeakPtr(), sync_file_info,
                  changes.front(), changes.PopAndGetNewList()));
 }
 
 }  // namespace sync_file_system