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

chrome/browser/extensions/api/file_system/file_system_api.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/extensions/api/file_system/file_system_api.h"
 
 #include "apps/saved_files_service.h"
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "base/bind.h"
@@ skipping 31 matching lines @@
 #include "webkit/browser/fileapi/external_mount_points.h"
 #include "webkit/browser/fileapi/isolated_context.h"
 #include "webkit/common/fileapi/file_system_types.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 #if defined(OS_MACOSX)
 #include <CoreFoundation/CoreFoundation.h>
 #include "base/mac/foundation_util.h"
 #endif
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/drive/file_system_util.h"
+#endif
+
 using apps::SavedFileEntry;
 using apps::SavedFilesService;
 using apps::ShellWindow;
 using fileapi::IsolatedContext;
 
 const char kInvalidCallingPage[] = "Invalid calling page. This function can't "
     "be called from a background page.";
 const char kUserCancelled[] = "User cancelled";
 const char kWritableFileErrorFormat[] = "Error opening %s";
 const char kRequiresFileSystemWriteError[] =
@@ skipping 629 matching lines @@
 
 void FileSystemChooseEntryFunction::FileSelectionCanceled() {
   error_ = kUserCancelled;
   SendResponse(false);
 }
 
 void FileSystemChooseEntryFunction::ConfirmDirectoryAccessOnFileThread(
     const std::vector<base::FilePath>& paths,
     content::WebContents* web_contents) {
   DCHECK_EQ(paths.size(), 1u);
+#if defined(OS_CHROMEOS)
+  const base::FilePath path =
+      drive::util::IsUnderDriveMountPoint(paths[0]) ? paths[0] :
+          base::MakeAbsoluteFilePath(paths[0]);
+#else
   const base::FilePath path = base::MakeAbsoluteFilePath(paths[0]);
+#endif
   if (path.empty()) {
     content::BrowserThread::PostTask(
         content::BrowserThread::UI,
         FROM_HERE,
         base::Bind(&FileSystemChooseEntryFunction::FileSelectionCanceled,
                    this));
     return;
   }
 
   for (size_t i = 0; i < arraysize(kGraylistedPaths); i++) {
@@ skipping 254 matching lines @@
   if (needs_new_entry) {
     is_directory_ = file_entry->is_directory;
     CreateResponse();
     AddEntryToResponse(file_entry->path, file_entry->id);
   }
   SendResponse(true);
   return true;
 }
 
 }  // namespace extensions