Add 1st cut of FileSystemUsageTracker that tracks the usage changes in FileSystem API.

webkit/fileapi/sandboxed_file_system_context.cc

 // Copyright (c) 2010 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/fileapi/sandboxed_file_system_context.h"
 
 #include "base/file_util.h"
 #include "base/message_loop_proxy.h"
 #include "webkit/fileapi/file_system_path_manager.h"
 #include "webkit/fileapi/file_system_quota_manager.h"
+#include "webkit/fileapi/file_system_usage_tracker.h"
 
 namespace fileapi {
 
 SandboxedFileSystemContext::SandboxedFileSystemContext(
     scoped_refptr<base::MessageLoopProxy> file_message_loop,
     scoped_refptr<base::MessageLoopProxy> io_message_loop,
     const FilePath& profile_path,
     bool is_incognito,
     bool allow_file_access,
     bool unlimited_quota)
     : file_message_loop_(file_message_loop),
       io_message_loop_(io_message_loop),
       path_manager_(new FileSystemPathManager(
           file_message_loop, profile_path, is_incognito, allow_file_access)),
       quota_manager_(new FileSystemQuotaManager(
-          allow_file_access, unlimited_quota)) {
+          allow_file_access, unlimited_quota)),
+      usage_tracker_(new FileSystemUsageTracker(
+          file_message_loop, profile_path, is_incognito)) {
 }
 
 SandboxedFileSystemContext::~SandboxedFileSystemContext() {
 }
 
 void SandboxedFileSystemContext::Shutdown() {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
   path_manager_.reset();
   quota_manager_.reset();
 }
@@ skipping 23 matching lines @@
 
 void SandboxedFileSystemContext::DeleteOnCorrectThread() const {
   if (!io_message_loop_->BelongsToCurrentThread()) {
     io_message_loop_->DeleteSoon(FROM_HERE, this);
     return;
   }
   delete this;
 }
 
 }  // namespace fileapi