Add GCMChannelStatusRequest to talk with server for all users

components/gcm_driver/gcm_backoff_policy.cc

+// Copyright 2014 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 "components/gcm_driver/gcm_backoff_policy.h"
+
+namespace gcm {
+
+namespace {
+
+// Backoff policy. Shared across GCM requests.
+// Note: In order to ensure a minimum of 20 seconds between server errors (for
+// server reasons), we have a 30s +- 10s (33%) jitter initial backoff.
+const net::BackoffEntry::Policy kDefaultBackoffPolicy = {
+  // Number of initial errors (in sequence) to ignore before applying
+  // exponential back-off rules.
+  0,
+
+  // Initial delay for exponential back-off in ms.
+  30 * 1000,  // 30 seconds.
+
+  // Factor by which the waiting time will be multiplied.
+  2,
+
+  // Fuzzing percentage. ex: 10% will spread requests randomly
+  // between 90%-100% of the calculated time.
+  0.33,  // 33%.
+
+  // Maximum amount of time we are willing to delay our request in ms.
+  10 * 60 * 1000, // 10 minutes.
+
+  // Time to keep an entry from being discarded even when it
+  // has no significant state, -1 to never discard.
+  -1,
+
+  // Don't use initial delay unless the last request was an error.
+  false,
+};
+
+}  // namespace
+
+const net::BackoffEntry::Policy& GetGCMBackoffPolicy() {
+  return kDefaultBackoffPolicy;
+}
+
+}  // namespace gcm