Ensure static BrowserContext methods only get called on the UI thread.

content/browser/resource_context_impl.cc

 // Copyright (c) 2012 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 "content/browser/resource_context_impl.h"
 
 #include "base/logging.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/fileapi/browser_file_system_helper.h"
 #include "content/browser/fileapi/chrome_blob_storage_context.h"
@@ skipping 157 matching lines @@
   job_factory->AddInterceptor(new DeveloperProtocolHandler(
       ResourceContext::GetAppCacheService(resource_context),
       GetBlobStorageControllerForResourceContext(resource_context)));
 
   // TODO(jam): Add the ProtocolHandlerRegistryIntercepter here!
 }
 
 }  // namespace
 
 AppCacheService* ResourceContext::GetAppCacheService(ResourceContext* context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return UserDataAdapter<ChromeAppCacheService>::Get(
       context, kAppCacheServicKeyName);
 }
 
 ResourceContext::ResourceContext() {
   if (ResourceDispatcherHostImpl::Get())
     ResourceDispatcherHostImpl::Get()->AddResourceContext(this);
 }
 
 ResourceContext::~ResourceContext() {
   ResourceDispatcherHostImpl* rdhi = ResourceDispatcherHostImpl::Get();
   if (rdhi) {
     rdhi->CancelRequestsForContext(this);
     rdhi->RemoveResourceContext(this);
   }
 }
 
 BlobStorageController* GetBlobStorageControllerForResourceContext(
     ResourceContext* resource_context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return GetChromeBlobStorageContextForResourceContext(resource_context)->
       controller();
 }
 
 DatabaseTracker* GetDatabaseTrackerForResourceContext(
     ResourceContext* resource_context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return UserDataAdapter<DatabaseTracker>::Get(
       resource_context, kDatabaseTrackerKeyName);
 }
 
 FileSystemContext* GetFileSystemContextForResourceContext(
     ResourceContext* resource_context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return UserDataAdapter<FileSystemContext>::Get(
       resource_context, kFileSystemContextKeyName);
 }
 
 IndexedDBContextImpl* GetIndexedDBContextForResourceContext(
     ResourceContext* resource_context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return UserDataAdapter<IndexedDBContextImpl>::Get(
       resource_context, kIndexedDBContextKeyName);
 }
 
 ChromeBlobStorageContext* GetChromeBlobStorageContextForResourceContext(
     ResourceContext* resource_context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return UserDataAdapter<ChromeBlobStorageContext>::Get(
       resource_context, kBlobStorageContextKeyName);
 }
 
 HostZoomMap* GetHostZoomMapForResourceContext(ResourceContext* context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   return static_cast<NonOwningZoomData*>(
       context->GetUserData(kHostZoomMapKeyName))->host_zoom_map();
 }
 
 void InitializeResourceContext(BrowserContext* browser_context) {
   ResourceContext* resource_context = browser_context->GetResourceContext();
   DCHECK(!resource_context->GetUserData(kIndexedDBContextKeyName));
 
   resource_context->SetUserData(
       kIndexedDBContextKeyName,
@@ skipping 36 matching lines @@
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&InitializeRequestContext,
                    resource_context,
                    make_scoped_refptr(
                        browser_context->GetRequestContextForMedia())));
   }
 }
 
 }  // namespace content