MacViews a11y: Sync VoiceOver cursor with keyboard focus.

base/mac/sdk_forward_declarations.h

 // 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.
 
 // This file contains forward declarations for items in later SDKs than the
 // default one with which Chromium is built (currently 10.10).
 // If you call any function from this header, be sure to check at runtime for
 // respondsToSelector: before calling these functions (else your code will crash
 // on older OS X versions that chrome still supports).
 
@@ skipping 215 matching lines @@
 #endif  // MAC_OS_X_VERSION_10_10
 
 // ----------------------------------------------------------------------------
 // The symbol for kCWSSIDDidChangeNotification is available in the
 // CoreWLAN.framework for OSX versions 10.6 through 10.10. The symbol is not
 // declared in the OSX 10.9+ SDK, so when compiling against an OSX 10.9+ SDK,
 // declare the symbol.
 // ----------------------------------------------------------------------------
 BASE_EXPORT extern "C" NSString* const kCWSSIDDidChangeNotification;
 
+extern "C" {
+// See http://openradar.appspot.com/9896491. This SPI has been tested on 10.5,
+// 10.6, and 10.7. It allows accessibility clients to observe events posted on
+// the |element| object.
+void NSAccessibilityUnregisterUniqueIdForUIElement(id element);

[tapted, 2016/09/26 05:19:17]

sdk_forward_declarations.h isn't really the right place for exposing private API
declarations - we want to make it really hard to use SPIs unintentionally. It
feels like heresey, but I think the right way to do this is to leave the
declaration in browser_accessibility_cocoa.mm and just copy+paste it into
bridged_content_view.mm as well (there, you can say "Also used in
BrowserAccessibilityCocoa.")

[Patti Lor, 2016/09/28 00:29:14]

See below comment, deleted this in both places.

+}
+
 #endif  // BASE_MAC_SDK_FORWARD_DECLARATIONS_H_