Implement DeleteFile and DeleteDirectory.

chrome/browser/media_galleries/linux/mtp_device_task_helper.h

Index: chrome/browser/media_galleries/linux/mtp_device_task_helper.h
diff --git a/chrome/browser/media_galleries/linux/mtp_device_task_helper.h b/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
index df284a12907fa01787b94d88aab019ceecda669e..a98c476a9fbedba028e75d63cfc14c6849d1c3bc 100644
--- a/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
+++ b/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
@@ -36,8 +36,13 @@ class MTPDeviceTaskHelper {
   typedef base::Callback<void(const storage::AsyncFileUtil::EntryList& entries,
                               bool has_more)> ReadDirectorySuccessCallback;
 
+  typedef base::Callback<void(const std::vector<uint32>& file_ids)>
+      ReadDirectoryEntryIdsSuccessCallback;
+
   typedef base::Closure CopyFileFromLocalSuccessCallback;
 
+  typedef base::Closure DeleteObjectSuccessCallback;
+
   typedef MTPDeviceAsyncDelegate::ErrorCallback ErrorCallback;
 
   MTPDeviceTaskHelper();
@@ -82,6 +87,11 @@ class MTPDeviceTaskHelper {
                      const ReadDirectorySuccessCallback& success_callback,
                      const ErrorCallback& error_callback);
 
+  void ReadDirectoryEntryIds(
+      const uint32 directory_id,
+      const ReadDirectoryEntryIdsSuccessCallback& success_callback,
+      const ErrorCallback& error_callback);
+
   // Forwards the WriteDataIntoSnapshotFile request to the MTPReadFileWorker
   // object.
   //
@@ -107,6 +117,11 @@ class MTPDeviceTaskHelper {
       const CopyFileFromLocalSuccessCallback& success_callback,
       const ErrorCallback& error_callback);
 
+  // Forwards DeleteObject request to the MediaTransferProtocolManager.
+  void DeleteObject(const uint32 object_id,
+                    const DeleteObjectSuccessCallback& success_callback,
+                    const ErrorCallback& error_callback);
+
   // Dispatches the CloseStorage request to the MediaTransferProtocolManager.
   void CloseStorage() const;
 
@@ -150,6 +165,12 @@ class MTPDeviceTaskHelper {
                           bool has_more,
                           bool error) const;
 
+  void OnDidReadDirectoryEntryIds(
+      const ReadDirectoryEntryIdsSuccessCallback& success_callback,
+      const ErrorCallback& error_callback,
+      const std::vector<uint32>& file_ids,
+      const bool error) const;
+
   // Intermediate step to finish a ReadBytes request.
   void OnGetFileInfoToReadBytes(
       const MTPDeviceAsyncDelegate::ReadBytesRequest& request,
@@ -171,13 +192,17 @@ class MTPDeviceTaskHelper {
       const std::string& data,
       bool error) const;
 
-  // Called when CopyFileFromLocal completed no matter if it succeeded or
-  // failed.
+  // Called when CopyFileFromLocal completes.
   void OnCopyFileFromLocal(
       const CopyFileFromLocalSuccessCallback& success_callback,
       const ErrorCallback& error_callback,
       const bool error) const;
 
+  // Called when DeleteObject completes.
+  void OnDeleteObject(const DeleteObjectSuccessCallback& success_callback,
+                      const ErrorCallback& error_callback,
+                      const bool error) const;
+
   // Called when the device is uninitialized.
   //
   // Runs |error_callback| on the IO thread to notify the caller about the