Implement Increment and Decrement accessible actions

content/renderer/accessibility/render_accessibility_impl.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/accessibility/render_accessibility_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 432 matching lines @@
 
   WebAXObject root = document.accessibilityObject();
   if (!root.updateLayoutAndCheckValidity())
     return;
 
   WebAXObject target = document.accessibilityObjectFromID(data.target_node_id);
   WebAXObject anchor = document.accessibilityObjectFromID(data.anchor_node_id);
   WebAXObject focus = document.accessibilityObjectFromID(data.focus_node_id);
 
   switch (data.action) {
+    case ui::AX_ACTION_DECREMENT:
+      target.decrement();
+      break;
     case ui::AX_ACTION_DO_DEFAULT:
       target.performDefaultAction();
       break;
     case ui::AX_ACTION_HIT_TEST:
       OnHitTest(data.target_point);
       break;
+    case ui::AX_ACTION_INCREMENT:
+      target.increment();
+      break;
     case ui::AX_ACTION_SCROLL_TO_MAKE_VISIBLE:
       target.scrollToMakeVisibleWithSubFocus(
           WebRect(data.target_rect.x(), data.target_rect.y(),
                   data.target_rect.width(), data.target_rect.height()));
       break;
     case ui::AX_ACTION_SCROLL_TO_POINT:
       target.scrollToGlobalPoint(
           WebPoint(data.target_point.x(), data.target_point.y()));
       break;
     case ui::AX_ACTION_SET_ACCESSIBILITY_FOCUS:
@@ skipping 160 matching lines @@
 
   const WebDocument& document = GetMainDocument();
   if (document.isNull())
     return;
 
   document.accessibilityObject().scrollToMakeVisibleWithSubFocus(
       WebRect(bounds.x(), bounds.y(), bounds.width(), bounds.height()));
 }
 
 }  // namespace content