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

chrome/common/extensions/api/automation.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.
 
 // The <code>chrome.automation</code> API allows developers to access the
 // automation (accessibility) tree for the browser. The tree resembles the DOM
 // tree, but only exposes the <em>semantic</em> structure of a page. It can be
 // used to programmatically interact with a page by examining names, roles, and
 // states, listening for events, and performing actions on nodes.
 [nocompile] namespace automation {
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     protected,
     readOnly,
     required,
     richlyEditable,
     selectable,
     selected,
     vertical,
     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.
   //
   //
   // nodeCreated means that this node was added to the tree and its parent is
   // new as well, so it's just one node in a new subtree that was added.
   enum TreeChangeType {
     /**
      * This node was added to the tree and its parent is new as well,
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     // Everything in the tree between the two node/offset pairs gets included
     // in the selection. The anchor is where the user started the selection,
     // while the focus is the point at which the selection gets extended
     // e.g. when dragging with a mouse or using the keyboard. For nodes with
     // the role staticText, the offset gives the character offset within
     // the value where the selection starts or ends, respectively.
     [nocompile] static void setDocumentSelection(
         SetDocumentSelectionParams params);
   };
 };