Event tracing for sync events

chrome/browser/sync/glue/data_type_manager_impl.cc

Index: chrome/browser/sync/glue/data_type_manager_impl.cc
diff --git a/chrome/browser/sync/glue/data_type_manager_impl.cc b/chrome/browser/sync/glue/data_type_manager_impl.cc
index 2d49be4b85407ad635ab8ebf14ccba40aa9b8796..341b27357989fe30dfd3e97439582a8d8e209663 100644
--- a/chrome/browser/sync/glue/data_type_manager_impl.cc
+++ b/chrome/browser/sync/glue/data_type_manager_impl.cc
@@ -10,6 +10,7 @@
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
+#include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
@@ -293,6 +294,8 @@ void DataTypeManagerImpl::StartNextType() {
   // front of the list.
   if (!needs_start_.empty()) {
     VLOG(1) << "Starting " << needs_start_[0]->name();
+    TRACE_EVENT_BEGIN1("sync", "ModelAssociation",
+                       "DataType", ModelTypeToString(needs_start_[0]->type()));
     needs_start_[0]->Start(
         NewCallback(this, &DataTypeManagerImpl::TypeStartCallback));
     return;
@@ -332,6 +335,8 @@ void DataTypeManagerImpl::TypeStartCallback(
   // on the UI thread.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
+  TRACE_EVENT_END0("sync", "ModelAssociation");
+
   if (state_ == STOPPING) {
     // If we reach this callback while stopping, this means that
     // DataTypeManager::Stop() was called while the current data type