drive: Supports shared-with-me search in searchDriveMetadata().

chrome/browser/chromeos/drive/drive_file_system_interface.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_INTERFACE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 108 matching lines @@
 
 struct DriveClientContext {
   explicit DriveClientContext(ContextType in_type) : type(in_type) {}
   ContextType type;
 };
 
 // Option enum to control eligible entries for searchMetadata().
 // SEARCH_METADATA_ALL is the default to investigate all the entries.
 // SEARCH_METADATA_EXCLUDE_HOSTED_DOCUMENTS excludes the hosted documents.
 // SEARCH_METADATA_EXCLUDE_DIRECTORIES excludes the directories from the result.
-// TODO(haruki): Add option for shared_with_me and offline.
+// SEARCH_METADATA_SHARED_WITH_ME targets only "shared-with-me" entries.
+// TODO(haruki): Add option for offline.
 enum SearchMetadataOptions {
   SEARCH_METADATA_ALL = 0,
   SEARCH_METADATA_EXCLUDE_HOSTED_DOCUMENTS = 1,
   SEARCH_METADATA_EXCLUDE_DIRECTORIES = 1 << 1,
+  SEARCH_METADATA_SHARED_WITH_ME = 1 << 2,
 };
 
 // Drive file system abstraction layer.
 // The interface is defined to make DriveFileSystem mockable.
 class DriveFileSystemInterface {
  public:
   virtual ~DriveFileSystemInterface() {}
 
   // Initializes the object. This function should be called before any
   // other functions.
@@ skipping 267 matching lines @@
   virtual void GetMetadata(
       const GetFilesystemMetadataCallback& callback) = 0;
 
   // Reloads the file system feeds from the server.
   virtual void Reload() = 0;
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_INTERFACE_H_