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

ui/accessibility/ax_enums.idl

Index: ui/accessibility/ax_enums.idl
diff --git a/ui/accessibility/ax_enums.idl b/ui/accessibility/ax_enums.idl
index d84530101c5f5815ac9f6cbd90853bd714839f21..f74004cc8a96a78504f27605ffc565284f763405 100644
--- a/ui/accessibility/ax_enums.idl
+++ b/ui/accessibility/ax_enums.idl
@@ -7,7 +7,7 @@
 // until the Chromium and Blink trees are merged.
 [camel_case_enum_to_string=true] namespace ui {
 
-  // For new entries to the following three enums, also add to
+  // For new entries to the following four enums, also add to
   // chrome/common/extensions/api/automation.idl. This is enforced
   // by a PRESUBMIT check.
   //
@@ -230,6 +230,38 @@
     visited
   };
 
+  // An action to be taken on an accessibility node.
+  enum AXAction {
+    // Do the default action for an object, typically this means "click".
+    do_default,
+
+    // Given a point, find the object it corresponds to and fire a
+    // HOVER event on it in response.
+    hit_test,
+
+    // Scroll any scrollable containers to make the target object visible
+    // on the screen.  Optionally pass a subfocus rect in
+    // AXActionData.target_rect.
+    scroll_to_make_visible,
+
+    // Scroll the given object to a specified point on the screen in
+    // global screen coordinates. Pass a point in AXActionData.target_point.
+    scroll_to_point,
+
+    set_accessibility_focus,
+    set_focus,
+    set_scroll_offset,
+    set_selection,
+    set_value,
+    show_context_menu
+  };
+
+  enum AXActionFlags {
+    request_images,
+    request_inline_text_boxes,
+    set_sequential_focus_navigation_point
+  };
+
   // A change to the accessibility tree.
   enum AXMutation {
     node_created,