Add feedback uploader to upload reports in a sequenced manner with retries.

chrome/browser/feedback/feedback_uploader.h

Index: chrome/browser/feedback/feedback_uploader.h
diff --git a/chrome/browser/feedback/feedback_uploader.h b/chrome/browser/feedback/feedback_uploader.h
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+// 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_FEEDBACK_FEEDBACK_UPLOADER_H_
+#define CHROME_BROWSER_FEEDBACK_FEEDBACK_UPLOADER_H_
+
+#include <queue>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "chrome/browser/feedback/feedback_uploader_delegate.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace feedback {
+
+struct FeedbackReport;
+
+// FeedbackUploader is used to add a feedback report to the queue of reports
+// being uploaded. In case uploading a report fails, it is written to disk and
+// tried again when it's turn comes up next in the queue.
+class FeedbackUploader : public BrowserContextKeyedService,
+                         public base::SupportsWeakPtr<FeedbackUploader> {
+ public:
+  explicit FeedbackUploader(content::BrowserContext* context);
+  virtual ~FeedbackUploader();
+
+  void QueueReport(scoped_ptr<std::string> data);
+
+ private:
+  friend class FeedbackUploaderTest;
+  struct ReportsUploadTimeComparator {
+    bool operator()(const FeedbackReport& a, const FeedbackReport& b) const;
+  };
+
+  // Dispatches the report to be uploaded.
+  void DispatchReport(scoped_ptr<std::string> data);
+
+  // Update our timer for uploading the next report.
+  void UpdateUploadTimer();
+
+  // Requeue this report with a delay.
+  void RetryReport(scoped_ptr<std::string> data);
+
+  void setup_for_test(const ReportDataCallback& dispatch_callback,
+                      const base::TimeDelta& retry_delay);
+
+  // Browser context this uploader was created for.
+  content::BrowserContext* context_;
+  // Timer to upload the next report at.
+  base::OneShotTimer<FeedbackUploader> upload_timer_;
+  // Priority queue of reports prioritized by the time the report is supposed
+  // to be uploaded at.
+  std::priority_queue<FeedbackReport,
+                      std::vector<FeedbackReport>,
+                      ReportsUploadTimeComparator> reports_queue_;
+
+  std::vector<FeedbackReport> loaded_reports_;
+
+  ReportDataCallback dispatch_callback_;
+  base::TimeDelta retry_delay_;
+
+  DISALLOW_COPY_AND_ASSIGN(FeedbackUploader);
+};
+
+}  // namespace feedback
+
+#endif  // CHROME_BROWSER_FEEDBACK_FEEDBACK_UPLOADER_H_