[fsp] Add support for closing files.

chrome/browser/chromeos/file_system_provider/fake_provided_file_system.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/chromeos/file_system_provider/fake_provided_file_system.h"
 
 #include <string>
 
 #include "base/files/file.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 14 matching lines @@
                                              &last_modified_time);
   DCHECK(result);
   entry_list->push_back(
       fileapi::DirectoryEntry(name, type, size, last_modified_time));
 }
 
 }  // namespace
 
 FakeProvidedFileSystem::FakeProvidedFileSystem(
     const ProvidedFileSystemInfo& file_system_info)
-    : file_system_info_(file_system_info) {
+    : file_system_info_(file_system_info), last_file_handle_(0) {
 }
 
 FakeProvidedFileSystem::~FakeProvidedFileSystem() {}
 
 void FakeProvidedFileSystem::RequestUnmount(
     const fileapi::AsyncFileUtil::StatusCallback& callback) {
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE, base::Bind(callback, base::File::FILE_OK));
 }
 
@@ skipping 65 matching lines @@
                       0 /* size */,
                       "Tue May 22 00:40:50 UTC 2014");
 
     base::MessageLoopProxy::current()->PostTask(
         FROM_HERE,
         base::Bind(
             callback, base::File::FILE_OK, entry_list, false /* has_more */));
   }
 }
 
-void FakeProvidedFileSystem::OpenFile(
-    const base::FilePath& file_path,
-    OpenFileMode mode,
-    bool create,
-    const fileapi::AsyncFileUtil::StatusCallback& callback) {
+void FakeProvidedFileSystem::OpenFile(const base::FilePath& file_path,
+                                      OpenFileMode mode,
+                                      bool create,
+                                      const OpenFileCallback& callback) {
   if (file_path.AsUTF8Unsafe() != "/hello.txt" ||
       mode == OPEN_FILE_MODE_WRITE || create) {
-    callback.Run(base::File::FILE_ERROR_SECURITY);
+    callback.Run(0 /* file_handle */, base::File::FILE_ERROR_SECURITY);
     return;
   }
 
+  const int file_handle = ++last_file_handle_;
+  callback.Run(file_handle, base::File::FILE_OK);
+}
+
+void FakeProvidedFileSystem::CloseFile(
+    int file_handle,
+    const fileapi::AsyncFileUtil::StatusCallback& callback) {
+  const std::set<int>::iterator opened_file_it =
+      opened_files_.find(file_handle);
+  if (opened_file_it == opened_files_.end()) {
+    callback.Run(base::File::FILE_ERROR_NOT_FOUND);
+    return;
+  }
+
+  opened_files_.erase(opened_file_it);
   callback.Run(base::File::FILE_OK);
 }
 
 const ProvidedFileSystemInfo& FakeProvidedFileSystem::GetFileSystemInfo()
     const {
   return file_system_info_;
 }
 
 RequestManager* FakeProvidedFileSystem::GetRequestManager() {
   NOTREACHED();
   return NULL;
 }
 
 ProvidedFileSystemInterface* FakeProvidedFileSystem::Create(
     extensions::EventRouter* event_router,
     const ProvidedFileSystemInfo& file_system_info) {
   return new FakeProvidedFileSystem(file_system_info);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos