sync: Refactor per-datatype throttling

sync/internal_api/sync_manager.cc

Index: sync/internal_api/sync_manager.cc
diff --git a/sync/internal_api/sync_manager.cc b/sync/internal_api/sync_manager.cc
index 9da3e2748f30182993e8cef69414d6c68d4ce05a..2f2f759e21604a3ad6283cae77a07d83db7fc5a5 100644
--- a/sync/internal_api/sync_manager.cc
+++ b/sync/internal_api/sync_manager.cc
@@ -18,6 +18,7 @@
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 #include "net/base/network_change_notifier.h"
+#include "sync/engine/throttled_data_type_tracker.h"
 #include "sync/engine/net/server_connection_manager.h"
 #include "sync/engine/nigori_util.h"
 #include "sync/engine/polling_constants.h"
@@ -146,6 +147,7 @@ class SyncManager::SyncInternal
         initialized_(false),
         testing_mode_(NON_TEST),
         observing_ip_address_changes_(false),
+        throttled_data_type_tracker_(&allstatus_),
         traffic_recorder_(kMaxMessagesToRecord, kMaxMessageSizeToRecord),
         encryptor_(NULL),
         unrecoverable_error_handler_(NULL),
@@ -608,6 +610,8 @@ class SyncManager::SyncInternal
   JsSyncManagerObserver js_sync_manager_observer_;
   JsMutationEventObserver js_mutation_event_observer_;
 
+  browser_sync::ThrottledDataTypeTracker throttled_data_type_tracker_;
+
   // This is for keeping track of client events to send to the server.
   DebugInfoEventListener debug_info_event_listener_;
 
@@ -952,6 +956,7 @@ bool SyncManager::SyncInternal::Init(
         directory(),
         model_safe_worker_registrar,
         extensions_activity_monitor,
+        &throttled_data_type_tracker_,
         listeners,
         &debug_info_event_listener_,
         &traffic_recorder_);