Send accessibility notifications to the frame client, not view client.

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index 7c0e284ed464076bb8bf71b755768938f119c001..982558b8ac86aa78041a856107445c48ed3eaf73 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -32,6 +32,7 @@
 #define WebFrameClient_h
 
 #include "../platform/WebColor.h"
+#include "WebAXObject.h"
 #include "WebDOMMessageEvent.h"
 #include "WebDataSource.h"
 #include "WebFrame.h"
@@ -554,6 +555,11 @@ public:
     // Access the embedder API for (client-based) screen orientation client .
     virtual WebScreenOrientationClient* webScreenOrientationClient() { return 0; }
 
+    // Accessibility -------------------------------------------------------
+
+    // Notifies embedder about an accessibility event.
+    virtual void postAccessibilityEvent(const WebAXObject&, WebAXEvent) { }
+
 protected:
     virtual ~WebFrameClient() { }
 };