[fsp] Implement storage::WatcherManager for FSP.

chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.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/fileapi/backend_delegate.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/buffering_file_stream_reader.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/buffering_file_stream_writer.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
+#include "chrome/browser/chromeos/file_system_provider/fileapi/watcher_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "storage/browser/blob/file_stream_reader.h"
 #include "storage/browser/fileapi/file_stream_writer.h"
 #include "storage/browser/fileapi/file_system_url.h"
 
 using content::BrowserThread;
 
 namespace chromeos {
 namespace file_system_provider {
 namespace {
 
 // Size of the stream reader internal buffer. At most this number of bytes will
 // be read ahead of the requested data.
 const int kReaderBufferSize = 512 * 1024;  // 512KB.
 
 // Size of the stream writer internal buffer. At most this number of bytes will
 // be postponed for writing.
 const int kWriterBufferSize = 512 * 1024;  // 512KB.
 
 }  // namespace
 
 BackendDelegate::BackendDelegate()
-    : async_file_util_(new internal::ProviderAsyncFileUtil) {}
+    : async_file_util_(new internal::ProviderAsyncFileUtil),
+      watcher_manager_(new WatcherManager) {
+}
 
 BackendDelegate::~BackendDelegate() {}
 
 storage::AsyncFileUtil* BackendDelegate::GetAsyncFileUtil(
     storage::FileSystemType type) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(storage::kFileSystemTypeProvided, type);
   return async_file_util_.get();
 }
 
@@ skipping 20 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
 
   return scoped_ptr<storage::FileStreamWriter>(new BufferingFileStreamWriter(
       scoped_ptr<storage::FileStreamWriter>(new FileStreamWriter(url, offset)),
       kWriterBufferSize));
 }
 
 storage::WatcherManager* BackendDelegate::GetWatcherManager(
     const storage::FileSystemURL& url) {
-  NOTIMPLEMENTED();
-  return NULL;
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
+  return watcher_manager_.get();
 }
 
 void BackendDelegate::GetRedirectURLForContents(
     const storage::FileSystemURL& url,
     const storage::URLCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
   callback.Run(GURL());
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos