sync: Buffer Protocol Events for about:sync page

chrome/browser/ui/webui/sync_internals_message_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/sync_internals_message_handler.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 23 matching lines @@
   ProfileSyncService* service = GetProfileSyncService();
   if (service && service->HasObserver(this)) {
     service->RemoveObserver(this);
     service->RemoveProtocolEventObserver(this);
   }
 }
 
 void SyncInternalsMessageHandler::RegisterMessages() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
-  // Register for ProfileSyncService events.
-  ProfileSyncService* service = GetProfileSyncService();
-  if (service) {
-    service->AddObserver(this);
-    service->AddProtocolEventObserver(this);
-    js_controller_ = service->GetJsController();
-    js_controller_->AddJsEventHandler(this);
-  }
+  web_ui()->RegisterMessageCallback(
+      "registerForEvents",
+      base::Bind(&SyncInternalsMessageHandler::HandleRegisterForEvents,
+                 base::Unretained(this)));
 
   web_ui()->RegisterMessageCallback(
       "requestUpdatedAboutInfo",
       base::Bind(&SyncInternalsMessageHandler::HandleRequestUpdatedAboutInfo,
                  base::Unretained(this)));
 
   web_ui()->RegisterMessageCallback(
       "requestListOfTypes",
       base::Bind(&SyncInternalsMessageHandler::HandleRequestListOfTypes,
                  base::Unretained(this)));
 
   RegisterJsControllerCallback("getAllNodes");
   RegisterJsControllerCallback("getClientServerTraffic");
 }
 
+void SyncInternalsMessageHandler::HandleRegisterForEvents(
+    const base::ListValue* args) {
+  DCHECK(args->empty());
+
+  ProfileSyncService* service = GetProfileSyncService();
+  if (service) {
+    service->AddObserver(this);
+    service->AddProtocolEventObserver(this);
+    js_controller_ = service->GetJsController();
+    js_controller_->AddJsEventHandler(this);
+  }
+}
+
 void SyncInternalsMessageHandler::HandleRequestUpdatedAboutInfo(
     const base::ListValue* args) {
   DCHECK(args->empty());
   SendAboutInfo();
 }
 
 void SyncInternalsMessageHandler::HandleRequestListOfTypes(
     const base::ListValue* args) {
   DCHECK(args->empty());
   base::DictionaryValue event_details;
@@ skipping 77 matching lines @@
 }
 
 // Gets the ProfileSyncService of the underlying original profile.
 // May return NULL (e.g., if sync is disabled on the command line).
 ProfileSyncService* SyncInternalsMessageHandler::GetProfileSyncService() {
   Profile* profile = Profile::FromWebUI(web_ui());
   ProfileSyncServiceFactory* factory = ProfileSyncServiceFactory::GetInstance();
   return factory->GetForProfile(profile->GetOriginalProfile());
 }