Reland: Add GCMChannelStatusSyncer to schedule requests and enable/disable GCM

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 6f928e270655acac9db5044563e8f81b5beb98b3..de0d749950c8b0a1a5c5fcb9f702301c0f37ae5b 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -83,6 +83,7 @@
 #include "components/autofill/core/browser/autofill_manager.h"
 #include "components/bookmarks/browser/bookmark_utils.h"
 #include "components/dom_distiller/core/distilled_page_prefs.h"
+#include "components/gcm_driver/gcm_channel_status_syncer.h"
 #include "components/google/core/browser/google_pref_names.h"
 #include "components/google/core/browser/google_url_tracker.h"
 #include "components/network_time/network_time_tracker.h"
@@ -348,6 +349,11 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
   RegisterBrowserViewLocalPrefs(registry);
 #endif
 
+#if !defined(OS_ANDROID)
+  // The native GCM is used on Android instead.
+  gcm::GCMChannelStatusSyncer::RegisterPrefs(registry);
+#endif  // !defined(OS_ANDROID)
+
   // Preferences registered only for migration (clearing or moving to a new key)
   // go here.
 #if !defined(OS_ANDROID)
@@ -442,6 +448,7 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   extensions::ExtensionSettingsHandler::RegisterProfilePrefs(registry);
   extensions::TabsCaptureVisibleTabFunction::RegisterProfilePrefs(registry);
   first_run::RegisterProfilePrefs(registry);
+  gcm::GCMChannelStatusSyncer::RegisterProfilePrefs(registry);
   NewTabUI::RegisterProfilePrefs(registry);
   PepperFlashSettingsManager::RegisterProfilePrefs(registry);
   PinnedTabCodec::RegisterProfilePrefs(registry);