gdata: Add GDataDirectoryService::GetEntryInfoByResourceId()

chrome/browser/chromeos/gdata/gdata_directory_service.h

Index: chrome/browser/chromeos/gdata/gdata_directory_service.h
diff --git a/chrome/browser/chromeos/gdata/gdata_directory_service.h b/chrome/browser/chromeos/gdata/gdata_directory_service.h
index ec6316117a948ed8aa091f9a2e353089a860b012..cdbfbe996fa87c41f336a862db5efa3874a0d307 100644
--- a/chrome/browser/chromeos/gdata/gdata_directory_service.h
+++ b/chrome/browser/chromeos/gdata/gdata_directory_service.h
@@ -196,15 +196,24 @@ class GDataDirectoryService {
   void GetEntryByResourceIdAsync(const std::string& resource_id,
                                  const GetEntryByResourceIdCallback& callback);
 
+  // Finds an entry (a file or a directory) by |resource_id|.
+  //
+  // Must be called from UI thread. |callback| is run on UI thread.
+  // |callback| must not be null.
+  void GetEntryInfoByResourceId(const std::string& resource_id,
+                                const GetEntryInfoCallback& callback);
+
   // Finds an entry (a file or a directory) by |file_path|.
   //
   // Must be called from UI thread. |callback| is run on UI thread.
+  // |callback| must not be null.
   void GetEntryInfoByPath(const FilePath& file_path,
                           const GetEntryInfoCallback& callback);
 
   // Finds and reads a directory by |file_path|.
   //
   // Must be called from UI thread. |callback| is run on UI thread.
+  // |callback| must not be null.
   void ReadDirectoryByPath(const FilePath& file_path,
                            const ReadDirectoryCallback& callback);
 
@@ -214,6 +223,7 @@ class GDataDirectoryService {
   // entry of |second_path|.
   //
   // Must be called from UI thread. |callback| is run on UI thread.
+  // |callback| must not be null.
   void GetEntryInfoPairByPaths(
       const FilePath& first_path,
       const FilePath& second_path,