Do not call stat() when reading directories via File API.

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 168 matching lines @@
   // As for now, it is impossible to create *::Params class directly, not from
   // base::Value.
   const std::string input =
       "[\n"
       "  \"testing-file-system\",\n"  // kFileSystemId
       "  2,\n"                        // kRequestId
       "  [\n"
       "    {\n"
       "      \"isDirectory\": false,\n"
       "      \"name\": \"blueberries.txt\",\n"
-      "      \"size\": 4096,\n"
-      "      \"modificationTime\": {\n"
-      "        \"value\": \"Thu Apr 24 00:46:52 UTC 2014\"\n"
       "      }\n"
       "    }\n"
       "  ],\n"
       "  false,\n"  // has_more
       "  0\n"       // execution_time
       "]\n";
   scoped_ptr<RequestValue> request_value;
   ASSERT_NO_FATAL_FAILURE(CreateRequestValueFromJSON(input, &request_value));
 
   const bool has_more = false;
   read_directory.OnSuccess(kRequestId, request_value.Pass(), has_more);
 
   ASSERT_EQ(1u, callback_logger.events().size());
   CallbackLogger::Event* event = callback_logger.events()[0];
   EXPECT_EQ(base::File::FILE_OK, event->result());
 
   ASSERT_EQ(1u, event->entry_list().size());
   const storage::DirectoryEntry entry = event->entry_list()[0];
   EXPECT_FALSE(entry.is_directory);
   EXPECT_EQ("blueberries.txt", entry.name);
-  EXPECT_EQ(4096, entry.size);
-  base::Time expected_time;
-  EXPECT_TRUE(
-      base::Time::FromString("Thu Apr 24 00:46:52 UTC 2014", &expected_time));
-  EXPECT_EQ(expected_time, entry.last_modified_time);
 }
 
 TEST_F(FileSystemProviderOperationsReadDirectoryTest,
        OnSuccess_InvalidMetadata) {
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   CallbackLogger callback_logger;
 
   ReadDirectory read_directory(NULL, file_system_info_,
                                base::FilePath(kDirectoryPath),
                                base::Bind(&CallbackLogger::OnReadDirectory,
@@ skipping 57 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