[fsp] Do not allow write operations on read only file systems.

chrome/browser/chromeos/file_system_provider/operations/create_directory_unittest.cc

Index: chrome/browser/chromeos/file_system_provider/operations/create_directory_unittest.cc
diff --git a/chrome/browser/chromeos/file_system_provider/operations/create_directory_unittest.cc b/chrome/browser/chromeos/file_system_provider/operations/create_directory_unittest.cc
index 6d1869a18b4bf946c9a8118854735eb63f620348..e4f191bb91a607063512f808089d721c5f93d399 100644
--- a/chrome/browser/chromeos/file_system_provider/operations/create_directory_unittest.cc
+++ b/chrome/browser/chromeos/file_system_provider/operations/create_directory_unittest.cc
@@ -115,6 +115,31 @@ TEST_F(FileSystemProviderOperationsCreateDirectoryTest, Execute_NoListener) {
   EXPECT_FALSE(create_directory.Execute(kRequestId));
 }
 
+TEST_F(FileSystemProviderOperationsCreateDirectoryTest, Execute_ReadOnly) {
+  util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
+  util::StatusCallbackLog callback_log;
+
+  const ProvidedFileSystemInfo read_only_file_system_info(
+      kExtensionId,
+      kFileSystemId,
+      "" /* file_system_name */,
+      false /* writable */,
+      base::FilePath() /* mount_path */);
+
+  CreateDirectory create_directory(
+      NULL,
+      read_only_file_system_info,
+      base::FilePath::FromUTF8Unsafe(kDirectoryPath),
+      false /* exclusive */,
+      true /* recursive */,
+      base::Bind(&util::LogStatusCallback, &callback_log));
+  create_directory.SetDispatchEventImplForTesting(
+      base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
+                 base::Unretained(&dispatcher)));
+
+  EXPECT_FALSE(create_directory.Execute(kRequestId));
+}
+
 TEST_F(FileSystemProviderOperationsCreateDirectoryTest, OnSuccess) {
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   util::StatusCallbackLog callback_log;