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

components/drive/chromeos/fake_file_system.cc

 // Copyright (c) 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 "components/drive/chromeos/fake_file_system.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 235 matching lines @@
     const GetFilePathCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
 void FakeFileSystem::FreeDiskSpaceIfNeededFor(
     int64_t num_bytes,
     const FreeDiskSpaceCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
+void FakeFileSystem::CalculateCacheSize(const CacheSizeCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+}
+
 void FakeFileSystem::CalculateEvictableCacheSize(
-    const EvictableCacheSizeCallback& callback) {
+    const CacheSizeCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
 // Implementation of GetFileContent.
 void FakeFileSystem::GetFileContentAfterGetResourceEntry(
     const GetFileContentInitializedCallback& initialized_callback,
     const google_apis::GetContentCallback& get_content_callback,
     const FileOperationCallback& completion_callback,
     FileError error,
     std::unique_ptr<ResourceEntry> entry) {
@@ skipping 146 matching lines @@
       callback.Run(FILE_ERROR_OK, std::move(entry));
       return;
     }
   }
 
   callback.Run(FILE_ERROR_NOT_FOUND, std::unique_ptr<ResourceEntry>());
 }
 
 }  // namespace test_util
 }  // namespace drive