Add the boilerplate for actions to File System Provider API.

chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h b/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
index ccb6ecf505fa640a825e7218f3466a05afbec2fb..df3f37419e5941614db63c5df65a242e7a6e594a 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h
@@ -51,6 +51,14 @@ struct EntryMetadata {
   DISALLOW_COPY_AND_ASSIGN(EntryMetadata);
 };
 
+// Represents actions for either a file or a directory.
+struct Action {
+  std::string id;
+  std::string title;
+};
+
+typedef std::vector<Action> Actions;
+
 // Mode of opening a file. Used by OpenFile().
 enum OpenFileMode { OPEN_FILE_MODE_READ, OPEN_FILE_MODE_WRITE };
 
@@ -91,6 +99,9 @@ class ProvidedFileSystemInterface {
   typedef base::Callback<void(scoped_ptr<EntryMetadata> entry_metadata,
                               base::File::Error result)> GetMetadataCallback;
 
+  typedef base::Callback<void(const Actions& actions, base::File::Error result)>
+      GetActionsCallback;
+
   // Mask of fields requested from the GetMetadata() call.
   typedef int MetadataFieldMask;
 
@@ -108,6 +119,11 @@ class ProvidedFileSystemInterface {
                                     MetadataFieldMask fields,
                                     const GetMetadataCallback& callback) = 0;
 
+  // Requests list of actions for the passed |entry_path|. It can be either a
+  // file or a directory.
+  virtual AbortCallback GetActions(const base::FilePath& entry_path,
+                                   const GetActionsCallback& callback) = 0;
+
   // Requests enumerating entries from the passed |directory_path|. The callback
   // can be called multiple times until |has_more| is set to false.
   virtual AbortCallback ReadDirectory(