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 23 matching lines @@
     getImageData,
     hitTest,
     makeVisible,
     resumeMedia,
     setAccessibilityFocus,
     setSequentialFocusNavigationStartingPoint,
     setSelection,
     startDuckingMedia,
     stopDuckingMedia,
     suspendMedia,
-    showContextMenu
+    showContextMenu,
+    customAction

[dmazzoni, 2017/06/06 03:06:00]

Sort this, the rest are all alphabetical

[yawano, 2017/06/08 09:25:29]

Done.

   };
 
   // Arguments required for all actions supplied to performAction.
   dictionary PerformActionRequiredParams {
     long treeID;
     long automationNodeID;
     ActionType actionType;
   };
 
+  dictionary PerformCustomActionParams {
+    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);
   };
 };