Implement DeleteFile and DeleteDirectory.

device/media_transfer_protocol/media_transfer_protocol_manager.h

Index: device/media_transfer_protocol/media_transfer_protocol_manager.h
diff --git a/device/media_transfer_protocol/media_transfer_protocol_manager.h b/device/media_transfer_protocol/media_transfer_protocol_manager.h
index 39eea9bb899307fc36b91c850bbdc74e9a1d9a38..ebeb12ed7d085721306ab761b1282a58e4ce4884 100644
--- a/device/media_transfer_protocol/media_transfer_protocol_manager.h
+++ b/device/media_transfer_protocol/media_transfer_protocol_manager.h
@@ -47,6 +47,12 @@ class MediaTransferProtocolManager {
                               bool has_more,
                               bool error)> ReadDirectoryCallback;
 
+  // A callback to handle the result of ReadDirectoryEntryIds.
+  // The first argument is a vector of file ids.
+  // The second argument is true if there was an error.
+  typedef base::Callback<void(const std::vector<uint32>& file_ids, bool error)>
+      ReadDirectoryEntryIdsCallback;
+
   // A callback to handle the result of ReadFileChunk.
   // The first argument is a string containing the file data.
   // The second argument is true if there was an error.
@@ -63,6 +69,10 @@ class MediaTransferProtocolManager {
   // The first argument is true if there was an error.
   typedef base::Callback<void(bool error)> CopyFileFromLocalCallback;
 
+  // A callback to handle the result of DeleteObject.
+  // The first argument is true if there was an error.
+  typedef base::Callback<void(bool error)> DeleteObjectCallback;
+
   // Implement this interface to be notified about MTP storage
   // attachment / detachment events.
   class Observer {
@@ -105,6 +115,13 @@ class MediaTransferProtocolManager {
                              uint32 file_id,
                              const ReadDirectoryCallback& callback) = 0;
 
+  // Reads directory entry ids from |file_id| on |storage_handle| and runs
+  // |callback|.
+  virtual void ReadDirectoryEntryIds(
+      const std::string& storage_handle,
+      const uint32 file_id,
+      const ReadDirectoryEntryIdsCallback& callback) = 0;
+
   // Reads file data from |file_id| on |storage_handle| and runs |callback|.
   // Reads |count| bytes of data starting at |offset|.
   virtual void ReadFileChunk(const std::string& storage_handle,
@@ -127,6 +144,11 @@ class MediaTransferProtocolManager {
                                  const std::string& file_name,
                                  const CopyFileFromLocalCallback& callback) = 0;
 
+  // Deletes |object_id|.
+  virtual void DeleteObject(const std::string& storage_handle,
+                            const uint32 object_id,
+                            const DeleteObjectCallback& callback) = 0;
+
   // Creates and returns the global MediaTransferProtocolManager instance.
   // On Linux, |task_runner| specifies the task runner to process asynchronous
   // operations.