[USS] Show USS counters in about:sync page

components/sync/driver/glue/sync_backend_host_core.cc

 // Copyright 2013 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 "components/sync/driver/glue/sync_backend_host_core.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 287 matching lines @@
     syncer::ModelType type,
     const syncer::UpdateCounters& counters) {
   host_.Call(
       FROM_HERE,
       &SyncBackendHostImpl::HandleDirectoryUpdateCountersUpdatedOnFrontendLoop,
       type, counters);
 }
 
 void SyncBackendHostCore::OnStatusCountersUpdated(
     syncer::ModelType type,
-    const syncer::StatusCounters& counters) {
+    std::unique_ptr<syncer::StatusCounters> counters) {
   host_.Call(
       FROM_HERE,
       &SyncBackendHostImpl::HandleDirectoryStatusCountersUpdatedOnFrontendLoop,
-      type, counters);
+      type, base::Passed(&counters));
 }
 
 void SyncBackendHostCore::OnActionableError(
     const syncer::SyncProtocolError& sync_error) {
   if (!sync_loop_)
     return;
   DCHECK(sync_loop_->task_runner()->BelongsToCurrentThread());
   host_.Call(FROM_HERE,
              &SyncBackendHostImpl::HandleActionableErrorEventOnFrontendLoop,
              sync_error);
@@ skipping 372 matching lines @@
 }
 
 void SyncBackendHostCore::ClearServerDataDone(
     const base::Closure& frontend_callback) {
   DCHECK(sync_loop_->task_runner()->BelongsToCurrentThread());
   host_.Call(FROM_HERE, &SyncBackendHostImpl::ClearServerDataDoneOnFrontendLoop,
              frontend_callback);
 }
 
 }  // namespace browser_sync