Add custom action support

chrome/common/extensions/api/automation_internal.idl

 // Copyright 2014 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.
 
 // This is the implementation layer of the chrome.automation API, and is
 // essentially a translation of the internal accessibility tree update system
 // into an extension API.
 namespace automationInternal {
   // Data for an accessibility event and/or an atomic change to an accessibility
   // tree. See ui/accessibility/ax_tree_update.h for an extended explanation of
@@ skipping 11 matching lines @@
     // The source of this event.
     DOMString eventFrom;
 
     // The mouse coordinates when this event fired.
     double mouseX;
     double mouseY;
   };
 
   // All possible actions that can be performed on automation nodes.
   enum ActionType {
+    customAction,
+    doDefault,
     focus,
-    doDefault,
     getImageData,
     hitTest,
     makeVisible,
     resumeMedia,
     setAccessibilityFocus,
     setSequentialFocusNavigationStartingPoint,
     setSelection,
+    showContextMenu,
     startDuckingMedia,
     stopDuckingMedia,
-    suspendMedia,
-    showContextMenu
+    suspendMedia
   };
 
   // Arguments required for all actions supplied to performAction.
   dictionary PerformActionRequiredParams {
     long treeID;
     long automationNodeID;
     ActionType actionType;
   };
 
+  dictionary PerformCustomActionParams {

[Devlin, 2017/06/14 18:23:10]

Is this used?

[yawano, 2017/06/15 10:43:21]

Yes, this is used. This is used in automation_internal_api.cc.

+    long customActionID;
+  };
+
   // Arguments for the setSelection action supplied to performAction.
   dictionary SetSelectionParams {
     // Reuses ActionRequiredParams automationNodeID to mean anchor node id,
     // and treeID to apply to both anchor and focus node ids.
     long focusNodeID;
     long anchorOffset;
     long focusOffset;
   };
 
   // Arguments for the querySelector function.
@@ skipping 66 matching lines @@
                              long nodeID,
                              DOMString changeType);
 
     static void onChildTreeID(long treeID, long nodeID);
 
     static void onNodesRemoved(long treeID, long[] nodeIDs);
 
     static void onAccessibilityTreeSerializationError(long treeID);
   };
 };