[SyncFS] Add verbose logging to SyncEngineInitializer

chrome/browser/sync_file_system/drive_backend/list_changes_task.cc

Index: chrome/browser/sync_file_system/drive_backend/list_changes_task.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/list_changes_task.cc b/chrome/browser/sync_file_system/drive_backend/list_changes_task.cc
index 535f4efc01fdf5a9fb1fed02f64ba96cd93831ec..9ecad64df54c64b8121c33b540a3c4628aa3f821 100644
--- a/chrome/browser/sync_file_system/drive_backend/list_changes_task.cc
+++ b/chrome/browser/sync_file_system/drive_backend/list_changes_task.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/sync_file_system/drive_backend/sync_engine_context.h"
 #include "chrome/browser/sync_file_system/drive_backend_v1/drive_file_sync_util.h"
 #include "chrome/browser/sync_file_system/logger.h"
+#include "chrome/browser/sync_file_system/logger.h"
 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
 #include "google_apis/drive/drive_api_parser.h"
 #include "google_apis/drive/gdata_wapi_parser.h"
@@ -45,8 +46,11 @@ ListChangesTask::~ListChangesTask() {
 }
 
 void ListChangesTask::Run(const SyncStatusCallback& callback) {
+  util::Log(logging::LOG_VERBOSE, FROM_HERE, "[Changes] Start.");
+
   if (!IsContextReady()) {
-    util::Log(logging::LOG_ERROR, FROM_HERE, "Failed to get required sercive.");
+    util::Log(logging::LOG_VERBOSE, FROM_HERE,
+              "[Changes] Failed to get required sercive.");
     RunSoon(FROM_HERE, base::Bind(callback, SYNC_STATUS_FAILED));
     return;
   }
@@ -63,13 +67,16 @@ void ListChangesTask::DidListChanges(
     scoped_ptr<google_apis::ResourceList> resource_list) {
   SyncStatusCode status = GDataErrorCodeToSyncStatusCode(error);
   if (status != SYNC_STATUS_OK) {
-    util::Log(logging::LOG_ERROR, FROM_HERE, "Failed to fetch change list.");
+    util::Log(logging::LOG_VERBOSE, FROM_HERE,
+              "[Changes] Failed to fetch change list.");
     callback.Run(SYNC_STATUS_NETWORK_ERROR);
     return;
   }
 
   if (!resource_list) {
     NOTREACHED();
+    util::Log(logging::LOG_VERBOSE, FROM_HERE,
+              "[Changes] Got invalid change list.");
     callback.Run(SYNC_STATUS_FAILED);
     return;
   }
@@ -95,10 +102,14 @@ void ListChangesTask::DidListChanges(
   }
 
   if (change_list_.empty()) {
+    util::Log(logging::LOG_VERBOSE, FROM_HERE, "[Changes] Got no change.");
     callback.Run(SYNC_STATUS_NO_CHANGE_TO_SYNC);
     return;
   }
 
+  util::Log(logging::LOG_VERBOSE, FROM_HERE,
+            "[Changes] Got %zd changes, updating MetadataDatabase.",
+            change_list_.size());
   metadata_database()->UpdateByChangeList(
       resource_list->largest_changestamp(),
       change_list_.Pass(), callback);