drive: Change FileCache::GetCacheEntry's return type to FileError

chrome/browser/chromeos/extensions/file_manager/private_api_drive.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_drive.h"
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_util.h"
 #include "chrome/browser/chromeos/file_manager/file_tasks.h"
@@ skipping 301 matching lines @@
         }
       }
     }
 
     file_system->GetCacheEntry(
         file_path_,
         base::Bind(&SingleDriveEntryPropertiesGetter::CacheStateReceived,
                    GetWeakPtr()));
   }
 
-  void CacheStateReceived(bool /* success */,
+  void CacheStateReceived(drive::FileError error,
                           const drive::FileCacheEntry& cache_entry) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-    // In case of an error (i.e. success is false), cache_entry.is_*() all
-    // returns false.
-    properties_->is_pinned.reset(new bool(cache_entry.is_pinned()));
-    properties_->is_present.reset(new bool(cache_entry.is_present()));
-
-    CompleteGetFileProperties(drive::FILE_ERROR_OK);
+    if (error == drive::FILE_ERROR_OK) {
+      properties_->is_pinned.reset(new bool(cache_entry.is_pinned()));
+      properties_->is_present.reset(new bool(cache_entry.is_present()));
+    } else if (error == drive::FILE_ERROR_NOT_FOUND) {
+      // NOT_FOUND is not an error, return OK instead.
+      error = drive::FILE_ERROR_OK;
+      properties_->is_pinned.reset(new bool(false));
+      properties_->is_present.reset(new bool(false));
+    }
+    CompleteGetFileProperties(error);
   }
 
   void CompleteGetFileProperties(drive::FileError error) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     DCHECK(!callback_.is_null());
     callback_.Run(error);
 
     delete this;
   }
 };  // class SingleDriveEntryPropertiesGetter
@@ skipping 549 matching lines @@
                  this));
   return true;
 }
 
 void FileBrowserPrivateRequestDriveShareFunction::OnAddPermission(
     drive::FileError error) {
   SendResponse(error == drive::FILE_ERROR_OK);
 }
 
 }  // namespace extensions