Re-land: Create AXAction and AXActionData as a way to simplify accessibility actions

chrome/common/extensions/api/automation.idl

Index: chrome/common/extensions/api/automation.idl
diff --git a/chrome/common/extensions/api/automation.idl b/chrome/common/extensions/api/automation.idl
index e8bf85586f2d25628eca959b3533f82581c8314f..2b8bbc0767b4f62333a199174b45282f4654e326 100644
--- a/chrome/common/extensions/api/automation.idl
+++ b/chrome/common/extensions/api/automation.idl
@@ -216,6 +216,20 @@
     visited
   };
 
+  // Actions that can be taken on an $(ref:automation.AutomationNode).
+  enum ActionType {
+    doDefault,
+    hitTest,
+    scrollToMakeVisible,
+    scrollToPoint,
+    setAccessibilityFocus,
+    setFocus,
+    setScrollOffset,
+    setSelection,
+    setValue,
+    showContextMenu
+  };
+
   // Possible changes to the automation tree. For any given atomic change
   // to the tree, each node that's added, removed, or changed, will appear
   // in exactly one TreeChange, with one of these types.