[fsp] Add support for moving files within a provided file system.

chrome/browser/chromeos/file_system_provider/fake_provided_file_system.cc

Index: chrome/browser/chromeos/file_system_provider/fake_provided_file_system.cc
diff --git a/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.cc b/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.cc
index 36536852053b82ae23b9e8a949f08c08a75eb9ce..d3bd7ccdba22245b4b90c603aa03e9c3bccfa1bd 100644
--- a/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.cc
+++ b/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.cc
@@ -258,6 +258,14 @@ void FakeProvidedFileSystem::CopyEntry(
       FROM_HERE, base::Bind(callback, base::File::FILE_OK));
 }
 
+void FakeProvidedFileSystem::MoveEntry(
+    const base::FilePath& source_path,
+    const base::FilePath& target_path,
+    const fileapi::AsyncFileUtil::StatusCallback& callback) {
+  base::MessageLoopProxy::current()->PostTask(
+      FROM_HERE, base::Bind(callback, base::File::FILE_OK));
+}
+
 const ProvidedFileSystemInfo& FakeProvidedFileSystem::GetFileSystemInfo()
     const {
   return file_system_info_;