Add custom action support

chrome/common/extensions/api/automation_internal.idl

Index: chrome/common/extensions/api/automation_internal.idl
diff --git a/chrome/common/extensions/api/automation_internal.idl b/chrome/common/extensions/api/automation_internal.idl
index a5cc24f88eec66a13ada0ff568b869e7aaa61b42..429751e10b7b7e1937a0437a0a0e8bc0cb7e1c4a 100644
--- a/chrome/common/extensions/api/automation_internal.idl
+++ b/chrome/common/extensions/api/automation_internal.idl
@@ -41,7 +41,8 @@ namespace automationInternal {
     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.
@@ -51,6 +52,10 @@ namespace automationInternal {
     ActionType actionType;
   };
 
+  dictionary PerformCustomActionParams {
+    long customActionID;
+  };
+
   // Arguments for the setSelection action supplied to performAction.
   dictionary SetSelectionParams {
     // Reuses ActionRequiredParams automationNodeID to mean anchor node id,