Implement NSAccessibilityScrollToVisibleAction on Mac

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 2780 matching lines @@
   if (![self instanceActive])
     return;
 
   // TODO(dmazzoni): Support more actions.
   if ([action isEqualToString:NSAccessibilityPressAction]) {
     [self delegate]->AccessibilityDoDefaultAction(
         browserAccessibility_->GetId());
   } else if ([action isEqualToString:NSAccessibilityShowMenuAction]) {
     [self delegate]->AccessibilityShowContextMenu(
         browserAccessibility_->GetId());
+  } else if ([action isEqualToString:NSAccessibilityScrollToVisibleAction]) {
+    browserAccessibility_->manager()->ScrollToMakeVisible(
+        *browserAccessibility_, gfx::Rect());
   }
 }
 
 // Returns the description of the given action.
 - (NSString*)accessibilityActionDescription:(NSString*)action {
   if (![self instanceActive])
     return nil;
 
   return NSAccessibilityActionDescription(action);
 }
@@ skipping 67 matching lines @@
   if (![self instanceActive])
     return [super hash];
   return browserAccessibility_->GetId();
 }
 
 - (BOOL)accessibilityShouldUseUniqueId {
   return YES;
 }
 
 @end