Add an API to get total size of Drive cache including non-evictable ones.

chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc

 // Copyright 2013 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/extensions/file_manager/private_api_file_system.h"
 
 #include <sys/statvfs.h>
 
 #include <set>
 #include <utility>
@@ skipping 72 matching lines @@
 // Used for OnCalculateEvictableCacheSize.
 typedef base::Callback<void(const uint64_t* total_size,
                             const uint64_t* remaining_space)>
     GetSizeStatsCallback;
 
 // Calculates the real remaining size of Download volume and pass it to
 // GetSizeStatsCallback.
 void OnCalculateEvictableCacheSize(const GetSizeStatsCallback& callback,
                                    uint64_t total_size,
                                    uint64_t remaining_size,
-                                   uint64_t evictable_cache_size) {
+                                   int64_t evictable_cache_size) {
   // For calculating real remaining size of Download volume
   // - Adds evictable cache size since the space is available if they are
   //   evicted.
   // - Subtracts minimum free space of cryptohome since the space is not
   //   available for file manager.
   const uint64_t real_remaining_size =
       std::max(static_cast<int64_t>(remaining_size + evictable_cache_size) -
                    cryptohome::kMinFreeSpaceInBytes,
                int64_t(0));
   callback.Run(&total_size, &real_remaining_size);
@@ skipping 889 matching lines @@
   return RespondLater();
 }
 
 void FileManagerPrivateInternalSetEntryTagFunction::OnSetEntryPropertyCompleted(
     drive::FileError result) {
   Respond(result == drive::FILE_ERROR_OK ? NoArguments()
                                          : Error("Failed to set a tag."));
 }
 
 }  // namespace extensions