[Sync] Display the client server traffic log in about:sync.

chrome/browser/sync/internal_api/sync_manager.cc

Index: chrome/browser/sync/internal_api/sync_manager.cc
diff --git a/chrome/browser/sync/internal_api/sync_manager.cc b/chrome/browser/sync/internal_api/sync_manager.cc
index 469f7df0cf813fae822c4b20f06436ae6e555b51..68ef8af6a7d13a72b4a0e73210144e3422e1fb66 100644
--- a/chrome/browser/sync/internal_api/sync_manager.cc
+++ b/chrome/browser/sync/internal_api/sync_manager.cc
@@ -122,6 +122,10 @@ namespace sync_api {
 const int SyncManager::kDefaultNudgeDelayMilliseconds = 200;
 const int SyncManager::kPreferencesNudgeDelayMilliseconds = 2000;
 
+// Maximum count and size for traffic recorder.
+const unsigned int kMaxMessagesToRecord = 10;
+const unsigned int kMaxMessageSizeToRecord = 5 * 1024;
+
 //////////////////////////////////////////////////////////////////////////
 // SyncManager's implementation: SyncManager::SyncInternal
 class SyncManager::SyncInternal
@@ -146,7 +150,8 @@ class SyncManager::SyncInternal
         unrecoverable_error_handler_(NULL),
         report_unrecoverable_error_function_(NULL),
         created_on_loop_(MessageLoop::current()),
-        nigori_overwrite_count_(0) {
+        nigori_overwrite_count_(0),
+        traffic_recorder_(kMaxMessagesToRecord, kMaxMessageSizeToRecord) {
     // Pre-fill |notification_info_map_|.
     for (int i = syncable::FIRST_REAL_MODEL_TYPE;
          i < syncable::MODEL_TYPE_COUNT; ++i) {
@@ -176,6 +181,9 @@ class SyncManager::SyncInternal
     BindJsMessageHandler(
         "findNodesContainingString",
         &SyncManager::SyncInternal::FindNodesContainingString);
+    BindJsMessageHandler(
+        "getClientServerTraffic",
+        &SyncManager::SyncInternal::GetClientServerTraffic);
   }
 
   virtual ~SyncInternal() {
@@ -520,6 +528,7 @@ class SyncManager::SyncInternal
   JsArgList GetNodeDetailsById(const JsArgList& args);
   JsArgList GetChildNodeIds(const JsArgList& args);
   JsArgList FindNodesContainingString(const JsArgList& args);
+  JsArgList GetClientServerTraffic(const JsArgList& args);
 
   FilePath database_path_;
 
@@ -609,6 +618,8 @@ class SyncManager::SyncInternal
   // This is for keeping track of client events to send to the server.
   DebugInfoEventListener debug_info_event_listener_;
 
+  browser_sync::TrafficRecorder traffic_recorder_;
+
   Encryptor* encryptor_;
   UnrecoverableErrorHandler* unrecoverable_error_handler_;
   ReportUnrecoverableErrorFunction report_unrecoverable_error_function_;
@@ -961,7 +972,8 @@ bool SyncManager::SyncInternal::Init(
         model_safe_worker_registrar,
         extensions_activity_monitor,
         listeners,
-        &debug_info_event_listener_);
+        &debug_info_event_listener_,
+        &traffic_recorder_);
     context->set_account_name(credentials.email);
     // The SyncScheduler takes ownership of |context|.
     scheduler_.reset(new SyncScheduler(name_, context, new Syncer()));
@@ -2207,6 +2219,15 @@ JsArgList SyncManager::SyncInternal::GetRootNodeDetails(
   return JsArgList(&return_args);
 }
 
+JsArgList SyncManager::SyncInternal::GetClientServerTraffic(
+    const JsArgList& args) {
+  ListValue return_args;
+  ListValue* value = traffic_recorder_.ToValue();
+  if (value != NULL)
+    return_args.Append(value);
+  return JsArgList(&return_args);
+}
+
 namespace {
 
 int64 GetId(const ListValue& ids, int i) {