Add support for refreshing contents of providers which don't support watchers.

chrome/browser/chromeos/file_system_provider/operations/read_directory_unittest.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/operations/read_directory.h"
 
 #include <string>
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
@@ skipping 86 matching lines @@
 }  // namespace
 
 class FileSystemProviderOperationsReadDirectoryTest : public testing::Test {
  protected:
   FileSystemProviderOperationsReadDirectoryTest() {}
   ~FileSystemProviderOperationsReadDirectoryTest() override {}
 
   void SetUp() override {
     file_system_info_ = ProvidedFileSystemInfo(
         kExtensionId, MountOptions(kFileSystemId, "" /* display_name */),
-        base::FilePath(), false /* configurable */, extensions::SOURCE_FILE);
+        base::FilePath(), false /* configurable */, true /* watchable */,
+        extensions::SOURCE_FILE);
   }
 
   ProvidedFileSystemInfo file_system_info_;
 };
 
 TEST_F(FileSystemProviderOperationsReadDirectoryTest, Execute) {
   using extensions::api::file_system_provider::ReadDirectoryRequestedOptions;
 
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   CallbackLogger callback_logger;
@@ skipping 165 matching lines @@
 
   ASSERT_EQ(1u, callback_logger.events().size());
   CallbackLogger::Event* event = callback_logger.events()[0];
   EXPECT_EQ(base::File::FILE_ERROR_TOO_MANY_OPENED, event->result());
   ASSERT_EQ(0u, event->entry_list().size());
 }
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos