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 1e8b7dd5b985d6a3a8969456d5ef5194b0599993..935a3a8b8fbf1f65b538903ed39d8172a644ec69 100644
--- a/sync/internal_api/sync_manager.cc
+++ b/sync/internal_api/sync_manager.cc
@@ -22,6 +22,7 @@
 #include "sync/engine/nigori_util.h"
 #include "sync/engine/sync_scheduler.h"
 #include "sync/engine/syncer_types.h"
+#include "sync/engine/throttled_data_type_tracker.h"
 #include "sync/internal_api/all_status.h"
 #include "sync/internal_api/base_node.h"
 #include "sync/internal_api/change_reorder_buffer.h"
@@ -144,6 +145,7 @@ 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),
@@ -602,6 +604,8 @@ 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_;
 
@@ -955,6 +959,7 @@ bool SyncManager::SyncInternal::Init(
         model_safe_routing_info,
         workers,
         extensions_activity_monitor,
+        &throttled_data_type_tracker_,
         listeners,
         &debug_info_event_listener_,
         &traffic_recorder_));