[SyncFS] Add browser_tests to test authentication state of SyncFS

chrome/browser/sync_file_system/sync_process_runner.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 "chrome/browser/sync_file_system/sync_process_runner.h"
 
+#include "base/debug/stack_trace.h"
 #include "base/format_macros.h"
 #include "chrome/browser/sync_file_system/logger.h"
 
 namespace sync_file_system {
 
 const int64 SyncProcessRunner::kSyncDelayInMilliseconds =
     1 * base::Time::kMillisecondsPerSecond; // 1 sec
 const int64 SyncProcessRunner::kSyncDelayWithSyncError =
     3 * base::Time::kMillisecondsPerSecond; // 3 sec
 const int64 SyncProcessRunner::kSyncDelayFastInMilliseconds = 100;  // 100 ms
@@ skipping 220 matching lines @@
       FROM_HERE, next_scheduled - now,
       base::Bind(&SyncProcessRunner::Run, base::Unretained(this)));
 }
 
 void SyncProcessRunner::CheckIfIdle() {
   if (pending_changes_ == 0 && running_tasks_ == 0)
     client_->OnSyncIdle();
 }
 
 }  // namespace sync_file_system