Creates a standard reporting BackoffEntry

Reporting will regularly need to do exponential backoff on failed
requests. This CL creates a standard BackoffEntry object for managing
failed requests.

Bug: chromium:1078512
Change-Id: I51e9ac33a344e200e283731a9f98430e86920461
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276632Reviewed-by: Leonid Baraz <lbaraz@chromium.org>
Commit-Queue: Zach Trudo <zatrudo@google.com>
Cr-Commit-Position: refs/heads/master@{#784219}

chrome/browser/BUILD.gn

@@ -1157,6 +1157,8 @@ static_library("browser") {
     "policy/messaging_layer/storage/storage_module.h",
     "policy/messaging_layer/storage/storage_queue.cc",
     "policy/messaging_layer/storage/storage_queue.h",
+    "policy/messaging_layer/util/backoff_settings.cc",
+    "policy/messaging_layer/util/backoff_settings.h",
     "policy/messaging_layer/util/status.cc",
     "policy/messaging_layer/util/status.h",
     "policy/messaging_layer/util/status_macros.h",

chrome/browser/policy/messaging_layer/util/backoff_settings.cc

+// Copyright 2020 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/policy/messaging_layer/util/backoff_settings.h"
+
+#include <memory>
+
+#include "net/base/backoff_entry.h"
+
+namespace reporting {
+
+std::unique_ptr<::net::BackoffEntry> GetBackoffEntry() {
+  // Retry starts with 10 second delay and is doubled with every failure.
+  static const net::BackoffEntry::Policy kDefaultUploadBackoffPolicy = {
+      // Number of initial errors to ignore before applying
+      // exponential back-off rules.
+      /*num_errors_to_ignore=*/0,
+
+      // Initial delay is 10 seconds.
+      /*initial_delay_ms=*/10 * 1000,
+
+      // Factor by which the waiting time will be multiplied.
+      /*multiply_factor=*/2,
+
+      // Fuzzing percentage.
+      /*jitter_factor=*/0.1,
+
+      // Maximum delay is 90 seconds.
+      /*maximum_backoff_ms=*/90 * 1000,
+
+      // It's up to the caller to reset the backoff time.
+      /*entry_lifetime_ms=*/-1,
+
+      /*always_use_initial_delay=*/true,
+  };
+  return std::make_unique<::net::BackoffEntry>(&kDefaultUploadBackoffPolicy);
+}
+
+}  // namespace reporting

chrome/browser/policy/messaging_layer/util/backoff_settings.h

+// Copyright 2020 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_POLICY_MESSAGING_LAYER_UTIL_BACKOFF_SETTINGS_H_
+#define CHROME_BROWSER_POLICY_MESSAGING_LAYER_UTIL_BACKOFF_SETTINGS_H_
+
+#include <memory>
+
+#include "net/base/backoff_entry.h"
+
+namespace reporting {
+
+// Returns a BackoffEntry object that defaults to initial 10 second delay and
+// doubles the delay on every failure, to a maximum delay of 90 seconds.
+// Caller owns the object and is responsible for resetting the delay on
+// successful completion.
+std::unique_ptr<::net::BackoffEntry> GetBackoffEntry();
+
+}  // namespace reporting
+
+#endif  // CHROME_BROWSER_POLICY_MESSAGING_LAYER_UTIL_BACKOFF_SETTINGS_H_