Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/fileapi/file_system_context.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 "webkit/browser/fileapi/file_system_context.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/task_runner_util.h"
@@ skipping 103 matching lines @@
           partition_path,
           special_storage_policy,
           options)),
       sandbox_backend_(new SandboxFileSystemBackend(
           sandbox_delegate_.get())),
       isolated_backend_(new IsolatedFileSystemBackend()),
       additional_backends_(additional_backends.Pass()),
       external_mount_points_(external_mount_points),
       partition_path_(partition_path),
       operation_runner_(new FileSystemOperationRunner(this)) {
-  if (quota_manager_proxy) {
-    quota_manager_proxy->RegisterClient(CreateQuotaClient(
-            this, options.is_incognito()));
-  }
-
   RegisterBackend(sandbox_backend_.get());
   RegisterBackend(isolated_backend_.get());
 
   for (ScopedVector<FileSystemBackend>::const_iterator iter =
           additional_backends_.begin();
        iter != additional_backends_.end(); ++iter) {
     RegisterBackend(*iter);
   }
 
+  if (quota_manager_proxy) {
+    // Quota client assumes all backends have registered.
+    quota_manager_proxy->RegisterClient(CreateQuotaClient(
+            this, options.is_incognito()));
+  }
+
   sandbox_backend_->Initialize(this);
   isolated_backend_->Initialize(this);
   for (ScopedVector<FileSystemBackend>::const_iterator iter =
           additional_backends_.begin();
        iter != additional_backends_.end(); ++iter) {
     (*iter)->Initialize(this);
   }
 
   // Additional mount points must be added before regular system-wide
   // mount points.
@@ skipping 291 matching lines @@
     FileSystemType type = static_cast<FileSystemType>(t);
     if (backend->CanHandleType(type)) {
       const bool inserted = backend_map_.insert(
           std::make_pair(type, backend)).second;
       DCHECK(inserted);
     }
   }
 }
 
 }  // namespace fileapi