Make chrome.fileSystem.chooseEntry work on Google Drive directories.

chrome/browser/chromeos/drive/file_system_util.cc

 // Copyright (c) 2012 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/drive/file_system_util.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 91 matching lines @@
 // Returns DriveIntegrationService instance, if Drive is enabled.
 // Otherwise, NULL.
 DriveIntegrationService* GetIntegrationServiceByProfile(Profile* profile) {
   DriveIntegrationService* service =
       DriveIntegrationServiceFactory::FindForProfile(profile);
   if (!service || !service->IsMounted())
     return NULL;
   return service;
 }
 
+void CheckDirectoryExistsAfterGetResourceEntry(
+    const FileOperationCallback& callback,
+    FileError error,
+    scoped_ptr<ResourceEntry> entry) {
+  if (error == FILE_ERROR_OK && !entry->file_info().is_directory())
+    error = FILE_ERROR_NOT_A_DIRECTORY;
+  callback.Run(error);
+}
+
 }  // namespace
 
 const base::FilePath& GetDriveGrandRootPath() {
   CR_DEFINE_STATIC_LOCAL(base::FilePath, grand_root_path,
       (util::kDriveGrandRootDirName));
   return grand_root_path;
 }
 
 const base::FilePath& GetDriveMyDriveRootPath() {
   CR_DEFINE_STATIC_LOCAL(base::FilePath, drive_root_path,
@@ skipping 214 matching lines @@
         ExtractDrivePath(directory),
         true /* is_exclusive */,
         true /* is_recursive */,
         callback);
   } else {
     base::MessageLoopProxy::current()->PostTask(
         FROM_HERE, base::Bind(callback, FILE_ERROR_OK));
   }
 }
 
+void CheckDirectoryExists(Profile* profile,
+                          const base::FilePath& directory,
+                          const FileOperationCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!callback.is_null());
+
+  FileSystemInterface* file_system = GetFileSystemByProfile(profile);
+  DCHECK(file_system);
+
+  file_system->GetResourceEntry(
+      ExtractDrivePath(directory),
+      base::Bind(&CheckDirectoryExistsAfterGetResourceEntry, callback));
+}
+
 void EmptyFileOperationCallback(FileError error) {
 }
 
 bool CreateGDocFile(const base::FilePath& file_path,
                     const GURL& url,
                     const std::string& resource_id) {
   std::string content = base::StringPrintf(
       "{\"url\": \"%s\", \"resource_id\": \"%s\"}",
       url.spec().c_str(), resource_id.c_str());
   return file_util::WriteFile(file_path, content.data(), content.size()) ==
@@ skipping 45 matching lines @@
   const bool disable_sync_over_celluar =
       profile->GetPrefs()->GetBoolean(prefs::kDisableDriveOverCellular);
 
   if (is_connection_cellular && disable_sync_over_celluar)
     return DRIVE_CONNECTED_METERED;
   return DRIVE_CONNECTED;
 }
 
 }  // namespace util
 }  // namespace drive