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

chrome/browser/chromeos/file_system_provider/operations/open_file_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/open_file.h"
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
@@ skipping 57 matching lines @@
 }  // namespace
 
 class FileSystemProviderOperationsOpenFileTest : public testing::Test {
  protected:
   FileSystemProviderOperationsOpenFileTest() {}
   ~FileSystemProviderOperationsOpenFileTest() 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(FileSystemProviderOperationsOpenFileTest, Execute) {
   using extensions::api::file_system_provider::OpenFileRequestedOptions;
 
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   CallbackLogger callback_logger;
@@ skipping 43 matching lines @@
   EXPECT_FALSE(open_file.Execute(kRequestId));
 }
 
 TEST_F(FileSystemProviderOperationsOpenFileTest, Execute_ReadOnly) {
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   CallbackLogger callback_logger;
 
   const ProvidedFileSystemInfo read_only_file_system_info(
       kExtensionId, MountOptions(kFileSystemId, "" /* display_name */),
       base::FilePath() /* mount_path */, false /* configurable */,
-      extensions::SOURCE_FILE);
+      true /* watchable */, extensions::SOURCE_FILE);
 
   // Opening for read on a read-only file system is allowed.
   {
     OpenFile open_file(NULL, read_only_file_system_info,
                        base::FilePath(kFilePath), OPEN_FILE_MODE_READ,
                        base::Bind(&CallbackLogger::OnOpenFile,
                                   base::Unretained(&callback_logger)));
     open_file.SetDispatchEventImplForTesting(
         base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
                    base::Unretained(&dispatcher)));
@@ skipping 57 matching lines @@
                     base::File::FILE_ERROR_TOO_MANY_OPENED);
   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(0, event->file_handle());
 }
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos