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

chrome/browser/chromeos/file_system_provider/operations/truncate_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/truncate.h"
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
@@ skipping 26 matching lines @@
 class FileSystemProviderOperationsTruncateTest : public testing::Test {
  protected:
   FileSystemProviderOperationsTruncateTest() {}
   ~FileSystemProviderOperationsTruncateTest() override {}
 
   void SetUp() override {
     MountOptions mount_options(kFileSystemId, "" /* display_name */);
     mount_options.writable = true;
     file_system_info_ = ProvidedFileSystemInfo(
         kExtensionId, mount_options, base::FilePath(), false /* configurable */,
-        extensions::SOURCE_FILE);
+        true /* watchable */, extensions::SOURCE_FILE);
   }
 
   ProvidedFileSystemInfo file_system_info_;
 };
 
 TEST_F(FileSystemProviderOperationsTruncateTest, Execute) {
   using extensions::api::file_system_provider::TruncateRequestedOptions;
 
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   util::StatusCallbackLog callback_log;
@@ skipping 40 matching lines @@
   EXPECT_FALSE(truncate.Execute(kRequestId));
 }
 
 TEST_F(FileSystemProviderOperationsTruncateTest, Execute_ReadOnly) {
   util::LoggingDispatchEventImpl dispatcher(false /* dispatch_reply */);
   util::StatusCallbackLog callback_log;
 
   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);
 
   Truncate truncate(NULL, file_system_info_, base::FilePath(kFilePath),
                     kTruncateLength,
                     base::Bind(&util::LogStatusCallback, &callback_log));
   truncate.SetDispatchEventImplForTesting(
       base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
                  base::Unretained(&dispatcher)));
 
   EXPECT_FALSE(truncate.Execute(kRequestId));
 }
@@ skipping 34 matching lines @@
   truncate.OnError(kRequestId,
                    scoped_ptr<RequestValue>(new RequestValue()),
                    base::File::FILE_ERROR_TOO_MANY_OPENED);
   ASSERT_EQ(1u, callback_log.size());
   EXPECT_EQ(base::File::FILE_ERROR_TOO_MANY_OPENED, callback_log[0]);
 }
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos