Added policy to disable/enable a system log upload.

chrome/browser/chromeos/policy/system_log_uploader.h

 // Copyright (c) 2015 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_CHROMEOS_POLICY_SYSTEM_LOG_UPLOADER_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_SYSTEM_LOG_UPLOADER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/policy/upload_job.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace policy {
 
 // Class responsible for periodically uploading system logs, it handles the
 // server responses by UploadJob:Delegate callbacks.
 class SystemLogUploader : public UploadJob::Delegate {
@@ skipping 43 matching lines @@
   // ever happened.
   base::Time last_upload_attempt() const { return last_upload_attempt_; }
 
   // UploadJob::Delegate:
   // Callbacks handle success and failure results of upload, destroy the
   // upload job.
   void OnSuccess() override;
   void OnFailure(UploadJob::ErrorCode error_code) override;
 
  private:
+  // Updates the system log upload enabled field from settings.
+  void RefreshUploadSettings();
+
   // Starts the system log loading process.
   void StartLogUpload();
 
   // The callback is invoked by the Delegate if system logs have been loaded
   // from disk, uploads system logs.
   void UploadSystemLogs(scoped_ptr<SystemLogs> system_logs);
 
   // Helper method that figures out when the next system log upload should
   // be scheduled.
   void ScheduleNextSystemLogUpload(base::TimeDelta frequency);
 
   // The number of consequent retries after the failed uploads.
   int retry_count_;
 
   // How long to wait between system log uploads.
   base::TimeDelta upload_frequency_;
 
   // The time the last upload attempt was performed.
   base::Time last_upload_attempt_;
 
   // TaskRunner used for scheduling upload tasks.
   const scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   // The upload job that is re-created on every system log upload.
   scoped_ptr<UploadJob> upload_job_;
 
   // The Delegate is used to load system logs and create UploadJobs.
   scoped_ptr<Delegate> syslog_delegate_;
 
+  // True if system log upload is enabled. Kept cached in this object because
+  // CrosSettings can switch to an unstrusted state temporarily, and we want to
+  // use the last-known trusted values.
+  bool upload_enabled_;
+
+  // Observer to changes in system log upload settings.
+  scoped_ptr<chromeos::CrosSettings::ObserverSubscription>
+      upload_enabled_observer_;
+
   base::ThreadChecker thread_checker_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<SystemLogUploader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemLogUploader);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_SYSTEM_LOG_UPLOADER_H_