[Sync] Clean up sync logging

chrome/browser/sync/engine/syncer_thread.h

Index: chrome/browser/sync/engine/syncer_thread.h
diff --git a/chrome/browser/sync/engine/syncer_thread.h b/chrome/browser/sync/engine/syncer_thread.h
index 67b9376e88b30a88330fe7fa418f1bffea2c9b1f..be7d028c0f5e6e5d8344972a5dc23cca6b73178d 100644
--- a/chrome/browser/sync/engine/syncer_thread.h
+++ b/chrome/browser/sync/engine/syncer_thread.h
@@ -7,6 +7,8 @@
 #define CHROME_BROWSER_SYNC_ENGINE_SYNCER_THREAD_H_
 #pragma once
 
+#include <string>
+
 #include "base/callback.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
@@ -43,8 +45,10 @@ class SyncerThread : public sessions::SyncSession::Delegate,
     NORMAL_MODE,
   };
 
-  // Takes ownership of both |context| and |syncer|.
-  SyncerThread(sessions::SyncSessionContext* context, Syncer* syncer);
+  // |name| is a display string to identify the syncer thread.  Takes
+  // |ownership of both |context| and |syncer|.
+  SyncerThread(const std::string& name,
+               sessions::SyncSessionContext* context, Syncer* syncer);
   virtual ~SyncerThread();
 
   typedef Callback0::Type ModeChangeCallback;
@@ -298,6 +302,8 @@ class SyncerThread : public sessions::SyncSession::Delegate,
   // the client starts up and does not need to perform an initial sync.
   void SendInitialSnapshot();
 
+  const std::string name_;
+
   base::Thread thread_;
 
   // Modifiable versions of kDefaultLongPollIntervalSeconds which can be