[SyncFS] Expose constants in SyncProcessRunner

chrome/browser/sync_file_system/sync_process_runner.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_PROCESS_RUNNER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_PROCESS_RUNNER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
 #include "chrome/browser/sync_file_system/sync_service_state.h"
 
 namespace sync_file_system {
 
 class SyncFileSystemService;
 
 // A base class to schedule a sync.
 // Each subclass must implement StartSync().
 // An instance of this class is supposed to be owned by SyncFileSystemService.
 //
 // Note that multiple SyncProcessRunner doesn't coordinate its sync schedule
 // with each other.
 class SyncProcessRunner {
  public:
+  // Default delay when more changes are available.
+  static const int64 kSyncDelayInMilliseconds;
+
+  // Default delay when the previous change has had an error (but remote service
+  // is running).
+  static const int64 kSyncDelayWithSyncError;
+
+  // Default delay when there're more than 10 pending changes.
+  static const int64 kSyncDelayFastInMilliseconds;
+  static const int kPendingChangeThresholdForFastSync;
+
+  // Default delay when remote service is temporarily unavailable.
+  // The delay backs off exponentially from initial value on repeated failure.
+  static const int64 kSyncDelaySlowInMilliseconds;
+
+  // Default delay when there're no changes.
+  static const int64 kSyncDelayMaxInMilliseconds;
+
   class Client {
    public:
     virtual ~Client() {}
     virtual void OnSyncIdle() {}
     virtual SyncServiceState GetSyncServiceState() = 0;
     virtual SyncFileSystemService* GetSyncService() = 0;
   };
 
   class TimerHelper {
    public:
@@ skipping 45 matching lines @@
   int64 last_delay_;
   int64 pending_changes_;
   base::WeakPtrFactory<SyncProcessRunner> factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncProcessRunner);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_PROCESS_RUNNER_H_