Implement Increment and Decrement accessible actions

content/browser/accessibility/browser_accessibility_cocoa.mm

 // 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 <execinfo.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 
@@ skipping 2777 matching lines @@
 
   // TODO(dmazzoni): Support more actions.
   BrowserAccessibilityManager* manager = browserAccessibility_->manager();
   if ([action isEqualToString:NSAccessibilityPressAction]) {
     manager->DoDefaultAction(*browserAccessibility_);
   } else if ([action isEqualToString:NSAccessibilityShowMenuAction]) {
     manager->ShowContextMenu(*browserAccessibility_);
   } else if ([action isEqualToString:NSAccessibilityScrollToVisibleAction]) {
     manager->ScrollToMakeVisible(
         *browserAccessibility_, gfx::Rect());
+  } else if ([action isEqualToString:NSAccessibilityIncrementAction]) {
+    manager->Increment(*browserAccessibility_);
+  } else if ([action isEqualToString:NSAccessibilityDecrementAction]) {
+    manager->Decrement(*browserAccessibility_);
   }
 }
 
 // Returns the description of the given action.
 - (NSString*)accessibilityActionDescription:(NSString*)action {
   if (![self instanceActive])
     return nil;
 
   return NSAccessibilityActionDescription(action);
 }
@@ skipping 60 matching lines @@
 }
 
 - (BOOL)accessibilityNotifiesWhenDestroyed {
   // Indicate that BrowserAccessibilityCocoa will post a notification when it's
   // destroyed (see -detach). This allows VoiceOver to do some internal things
   // more efficiently.
   return YES;
 }
 
 @end